• Sublime Core Feed
High Severity

Attachment: Decoy PDF author (Julie P.)

Description

This detection rule matches on messages containing one or more Decoy PDF attachments with metadata discovered to have been assoicated with malicious email campaigns featuring CrowdStrike, DocuSign, Human Resource and password expiration lures.

References

No references.

Sublime Security
Created Jul 26th, 2024 • Last updated Aug 5th, 2025
Source
type.inbound
and length(attachments) > 0
and any(attachments,
        .size <= 250000
        and .file_extension == "pdf"
        and any(file.explode(.),
                (
                  .scan.exiftool.producer == "DocFly"
                  or any(.scan.exiftool.fields,
                         .key == "XMPToolkit"
                         and strings.icontains(.value, 'DynaPDF')
                  )
                )
                and (
                  any(.scan.exiftool.fields,
                      .key == "CreatorTool"
                      and .value == "Acrobat PDFMaker 24 for Word"
                  )
                  or any(.scan.exiftool.fields,
                         .key == "ContentTypeId"
                         and .value == "2.2388136001807807e+43"
                  )
                  or any(.scan.exiftool.fields,
                         .key == "Creator"
                         and .value in ('Julie Peters', 'Julie Pieters')
                  )
                  or any(.scan.exiftool.fields,
                         .key == "Author"
                         and .value in ('Julie Peters', 'Julie Pieters')
                  )
                )
        )
)
and (
  not profile.by_sender().solicited
  or (
    profile.by_sender().any_messages_malicious_or_spam
    and not profile.by_sender().any_messages_benign
  )
)
and not profile.by_sender().any_messages_benign
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