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high
POLYGLOT_PDF_ZIP_APPENDED
What it means
ZIP local-file header appears after the last %%EOF in a PDF.
Why it fires
Polyglot files carry valid bytes for two formats simultaneously. A PDF followed by a ZIP local-file header at the tail will open in a PDF reader as the document and in an archive parser as the ZIP. This is a known exploitation primitive used to smuggle payloads past one-format scanners.
Other General heuristics
POLYGLOT_PDF_APPENDED_ZIP_CVE_BUNDLE EXTRACTED_FILE_CLAMAV POLYGLOT_GIF_PDF_FORCEDENTRY_SHAPE SPEC_DIVERGENCE_HIGH PDF_EXTENSION_MISMATCH EXTRACTED_FILE_STATIC_TRIAGE CORPUS_HISTORICALLY_MALICIOUS POLYGLOT_TEXT_PDF 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