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high
POLYGLOT_TEXT_PDF
What it means
%PDF- magic and %%EOF trailer found inside a text document.
Why it fires
A document classified as HTML, RTF, or script that also contains a fully formed %PDF body (header and trailer) is a polyglot: browsers render the wrapper, PDF readers open the embedded document. Used to deliver PDF exploits while evading file-type-based filtering.
Other General heuristics
POLYGLOT_PDF_APPENDED_ZIP_CVE_BUNDLE EXTRACTED_FILE_CLAMAV POLYGLOT_GIF_PDF_FORCEDENTRY_SHAPE SPEC_DIVERGENCE_HIGH PDF_EXTENSION_MISMATCH POLYGLOT_PDF_ZIP_APPENDED EXTRACTED_FILE_STATIC_TRIAGE CORPUS_HISTORICALLY_MALICIOUS POLYGLOT_ZIP_PREFIXED FORMAT_NEUTRAL_SCAN PPT_FOPT_COMPLEX_DATA_OVERFLOW PPT_FOPT_PROPERTY_TABLE_TRUNCATED CORPUS_RARE_COMBINATION CORPUS_RARE_STRUCTURAL_FEATURE_SET ANALYSIS_TIMEOUT_PARTIAL EMBEDDED_URL MACRO_VALID_PUBLISHER_SIGNATURE SCAN_OPTIONAL_STAGES_SKIPPED POLYGLOT_PDF_APPENDED_ZIP_SCAN_INCOMPLETE SCAN_INCOMPLETE UNKNOWN_FORMAT