Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6936a7ef227d76a…

MALICIOUS

PDF

5.2 KB
MD5: 043149e3e3993ac94d28a5161ac2ab0d SHA-1: 823a987cac4a6b7e928f51c4939d2b3577b8a1bd SHA-256: f6936a7ef227d76a979f4a6db2d6979f906561d9868fb14d285a8502f917c55f
144 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1566.002 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it contains an exploit. The presence of PDF_JAVASCRIPT and PDF_JS heuristics confirms that embedded JavaScript is used, likely to trigger the exploit. The PDF_FROMCHARCODE heuristic suggests obfuscation techniques were employed within the script. The ML_NYX_PDF_MALICIOUS score of 0.999986 strongly supports the malicious classification.

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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