Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7314be785f92cea…

MALICIOUS

PDF

5.2 KB
MD5: a1769469236ac33b93a9d5483021f902 SHA-1: 90e830233ce94596ab41e453872c02fa4b8896cf SHA-256: f7314be785f92ceaae7f7c95f0ba1f881d3e8026a52557f8c01ba589d8b6660b
144 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF file was flagged as malicious by multiple detection engines, including ClamAV and an ML classifier. Heuristics indicate the presence of JavaScript and the use of PDF filters (ASCIIHexDecode, ASCII85Decode) often associated with exploits. The differential parser failure also suggests malformed or intentionally obfuscated content. While no specific document body text or scripts were extracted, the combination of these indicators strongly suggests an exploit attempt within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • ClamAV: Pdf.Exploit.Agent-36178 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36178
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85
    ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.

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