Attachment: HTML smuggling with fromCharCode and other signals

type.inbound
and any(attachments,
        (
          .file_extension in~ ("html", "htm", "shtml", "dhtml")
          or .file_extension in~ $file_extensions_common_archives
          or .file_type == "html"
        )
        and any(file.explode(.),
                length(.scan.javascript.identifiers) < 100
                and "location" in .scan.javascript.identifiers
                and "charCodeAt" in .scan.javascript.identifiers
                and "fromCharCode" in .scan.javascript.identifiers
                and "indexOf" in .scan.javascript.identifiers
                and "try" in .scan.javascript.keywords
                and "catch" in .scan.javascript.keywords
        )
)