Sublime Core Feed

This repo contains open-source Rules for Sublime, a free and open platform for detecting and preventing email attacks like BEC, malware, and credential phishing.

Sublime Security

Last updated Sep 30th, 2026

Feed Source

GitHub

Tactic or Technique is

Rule Name & Severity	Author	Last Updated	Labels
Adobe branded PDF file linking to a password-protected file from untrusted sender	Sublime Security	5mo ago Apr 29th, 2026	Malware/Ransomware Encryption Evasion Impersonation: Brand PDF Archive analysis File analysis Natural Language Understanding Optical Character Recognition
Attachment: Adobe Sign lure PDF with embedded banner images	Sublime Security	3mo ago Jun 3rd, 2026	Credential Phishing PDF Impersonation: Brand File analysis YARA
Attachment: Archive with pdf, txt and wsf files	Sublime Security	8mo ago Jan 12th, 2026	Malware/Ransomware Evasion PDF Archive analysis File analysis
Attachment: Callback phishing solicitation via pdf file	Sublime Security	2d ago Sep 28th, 2026	Callback Phishing Evasion Free email provider Out of band pivot PDF Social engineering Exif analysis File analysis Optical Character Recognition Sender analysis
Attachment: Canva PDF with susupicious author metadata	Sublime Security	3mo ago Jun 5th, 2026	BEC/Fraud Credential Phishing Free email provider PDF Exif analysis File analysis
Attachment: Compensation review lure with QR code	Sublime Security	7d ago Sep 23rd, 2026	Credential Phishing PDF QR code Social engineering File analysis Optical Character Recognition QR code analysis Natural Language Understanding Sender analysis Header analysis
Attachment: Decoy PDF author (Julie P.)	Sublime Security	5mo ago Apr 29th, 2026	Credential Phishing Impersonation: Brand PDF File analysis Content analysis
Attachment: DocuSign impersonation via PDF linking to new domain	Sublime Security	7d ago Sep 23rd, 2026	Credential Phishing Impersonation: Brand PDF Social engineering Header analysis Sender analysis URL analysis File analysis Computer Vision Whois
Attachment: Duplicated header pages in fraudulent multi-page PDF Request for Quotation	Sublime Security	3mo ago Jun 25th, 2026	BEC/Fraud PDF Social engineering Optical Character Recognition Content analysis File analysis
Attachment: Encrypted PDF With Credential Harvesting Indicators	Sublime Security	3mo ago Jun 5th, 2026	Credential Phishing Encryption Evasion PDF File analysis YARA
Attachment: Encrypted PDF with credential theft body	Sublime Security	5d ago Sep 25th, 2026	Credential Phishing Encryption Evasion PDF Social engineering Content analysis Exif analysis File analysis Natural Language Understanding Sender analysis
Attachment: Encrypted PDF with credential theft language in EML	Sublime Security	26d ago Sep 4th, 2026	Credential Phishing Encryption Evasion PDF Social engineering Content analysis Exif analysis File analysis Natural Language Understanding Sender analysis
Attachment: Fake PDF Invoices Yara	Sublime Security	3mo ago Jun 16th, 2026	Malware/Ransomware Credential Phishing PDF Social engineering Content analysis File analysis YARA
Attachment: Fake research internship offer	Sublime Security	29d ago Sep 1st, 2026	BEC/Fraud Spam PDF Social engineering Out of band pivot Free email provider Optical Character Recognition Content analysis File analysis
Attachment: Fake scan-to-email	Sublime Security	1y ago Sep 22nd, 2025	Credential Phishing Free file host Image as content PDF Social engineering Content analysis File analysis Natural Language Understanding Optical Character Recognition Sender analysis
Attachment: Fake voicemail via PDF	Sublime Security	5mo ago Apr 30th, 2026	Credential Phishing PDF QR code Social engineering Computer Vision Content analysis File analysis Optical Character Recognition QR code analysis URL analysis
Attachment: Fictitious invoice using LinkedIn's address	Sublime Security	2mo ago Jul 29th, 2026	BEC/Fraud PDF Social engineering File analysis Optical Character Recognition Natural Language Understanding Content analysis Exif analysis
Attachment: Finance themed PDF with observed phishing template	Sublime Security	7mo ago Mar 2nd, 2026	Credential Phishing PDF Evasion File analysis Content analysis
Attachment: Hex-encoded recipient email in URL fragment	Sublime Security	14d ago Sep 16th, 2026	Credential Phishing BEC/Fraud Social engineering Evasion PDF File analysis URL analysis Content analysis
Attachment: Identity Confirmation With Document Unlock Code	Sublime Security	2mo ago Jul 28th, 2026	Credential Phishing Social engineering Encryption PDF Content analysis
Attachment: Invoice and W-9 PDFs with suspicious creators	Sublime Security	1mo ago Aug 25th, 2026	BEC/Fraud PDF Social engineering Impersonation: Brand File analysis Optical Character Recognition Exif analysis Content analysis
Attachment: Legal themed message or PDF with suspicious indicators	Sublime Security	15d ago Sep 15th, 2026	Credential Phishing Extortion BEC/Fraud Evasion PDF Social engineering Content analysis File analysis Natural Language Understanding Optical Character Recognition URL analysis Whois Header analysis Exif analysis
Attachment: Microsoft impersonation via PDF with link and suspicious language	Sublime Security	7d ago Sep 23rd, 2026	Credential Phishing Malware/Ransomware Image as content Impersonation: Brand PDF Scripting Social engineering Computer Vision File analysis Header analysis Natural Language Understanding Sender analysis
Attachment: Microsoft OAuth credential harvesting via EML with embedded malicious links	Sublime Security	2d ago Sep 28th, 2026	Credential Phishing Impersonation: Brand Evasion PDF File analysis URL analysis Content analysis
Attachment: Password-protected PDF with fake document indicators	Sublime Security	8mo ago Jan 21st, 2026	Malware/Ransomware Credential Phishing Encryption Evasion PDF File analysis YARA Exif analysis
Attachment: PDF Attachment with links to workers.dev	Sublime Security	3mo ago Jun 4th, 2026	Credential Phishing PDF Free subdomain host Evasion File analysis Exif analysis URL analysis
Attachment: PDF bid/proposal lure with credential theft indicators	Sublime Security	6mo ago Mar 27th, 2026	BEC/Fraud Credential Phishing PDF Social engineering Free file host Free subdomain host File analysis Content analysis Optical Character Recognition Natural Language Understanding URL analysis Exif analysis
Attachment: PDF contains W9 or invoice YARA signatures	Sublime Security	6mo ago Mar 18th, 2026	BEC/Fraud Credential Phishing PDF Social engineering File analysis YARA
Attachment: PDF credential phishing via wkhtmltopdf/Qt with suspicious link	Sublime Security	22h ago Sep 29th, 2026	Credential Phishing PDF Open redirect Social engineering Exif analysis Optical Character Recognition Natural Language Understanding URL analysis File analysis
Attachment: PDF document portal credential theft lure	Sublime Security	12d ago Sep 18th, 2026	Credential Phishing PDF Social engineering File analysis Content analysis Natural Language Understanding Header analysis Sender analysis
Attachment: PDF file with link to fake Bitcoin exchange	Sublime Security	8mo ago Jan 12th, 2026	BEC/Fraud Free email provider Impersonation: Brand PDF Social engineering Exif analysis File analysis Sender analysis URL analysis
Attachment: PDF file with low reputation links to suspicious filetypes (unsolicited)	Sublime Security	8mo ago Jan 12th, 2026	Malware/Ransomware Evasion PDF Archive analysis File analysis Sender analysis
Attachment: PDF file with low reputation link to ZIP file (unsolicited)	Michael Tingle	8mo ago Jan 12th, 2026	Malware/Ransomware Evasion PDF Archive analysis File analysis Natural Language Understanding Sender analysis URL analysis
Attachment: PDF file with recipient domain and ATT eCheckRun pattern	Sublime Security	3mo ago Jun 16th, 2026	BEC/Fraud PDF Social engineering File analysis Content analysis
Attachment: PDF generated with wkhtmltopdf tool and default title	Sublime Security	9mo ago Dec 19th, 2025	BEC/Fraud Callback Phishing Credential Phishing Malware/Ransomware PDF Evasion File analysis Exif analysis
Attachment: PDF Grant Payment lure with embedded link	Sublime Security	1mo ago Aug 26th, 2026	Credential Phishing PDF Social engineering File analysis URL analysis Content analysis
Attachment: PDF Object Hash associated with a fake invoice and a W-9	Sublime Security	2mo ago Jul 2nd, 2026	BEC/Fraud PDF Evasion File analysis Threat Intelligence
Attachment: PDF Object Hash associated with fake Canada Revenue Agency documents	Sublime Security	3mo ago Jun 17th, 2026	Credential Phishing Malware/Ransomware PDF Evasion File analysis Threat Intelligence
Attachment: PDF Object Hash - Encrypted PDFs with fake payment notification	Sublime Security	7mo ago Mar 2nd, 2026	Malware/Ransomware PDF Evasion File analysis Threat intelligence
Attachment: PDF Object Hash - Encrypted PDF with proposal bid lure	Sublime Security	8d ago Sep 22nd, 2026	Malware/Ransomware PDF File analysis Threat intelligence
Attachment: PDF Object Hash with Blue File Icon	Sublime Security	3mo ago Jun 5th, 2026	Malware/Ransomware PDF Evasion File analysis
Attachment: PDF proposal with credential theft indicators	Sublime Security	1mo ago Aug 24th, 2026	Credential Phishing PDF Social engineering Evasion File analysis Natural Language Understanding Optical Character Recognition URL analysis
Attachment: PDF RFP lure	Sublime Security	27d ago Sep 3rd, 2026	Credential Phishing BEC/Fraud PDF Social engineering YARA File analysis
Attachment: PDF templated investment lure	Sublime Security	1mo ago Aug 19th, 2026	Malware/Ransomware Credential Phishing PDF Social engineering YARA File analysis
Attachment: PDF W9 signature reuse	Sublime Security	2d ago Sep 28th, 2026	BEC/Fraud PDF Social engineering File analysis YARA
Attachment: PDF with a suspicious string and single URL	Sublime Security	14d ago Sep 16th, 2026	Credential Phishing PDF Social engineering Evasion Content analysis File analysis URL analysis Exif analysis
Attachment: PDF with base64 JavaScript and eval functions	Sublime Security	1mo ago Aug 11th, 2026	Malware/Ransomware Evasion PDF File analysis Javascript analysis YARA
Attachment: PDF with blurry lure image	Sublime Security	3mo ago Jun 5th, 2026	Credential Phishing PDF File analysis YARA
Attachment: PDF with bolded passcode	Sublime Security	22d ago Sep 8th, 2026	Credential Phishing PDF Evasion Social engineering HTML analysis Content analysis File analysis
Attachment: PDF with credential theft language and invalid reply-to domain	Sublime Security	5mo ago Apr 10th, 2026	Credential Phishing PDF Social engineering Spoofing File analysis Header analysis Natural Language Understanding Content analysis

120 Rules

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