Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ae0fefe44ffbc7…

MALICIOUS

PDF

5.1 KB
MD5: c264caa50448b60b0852432605a8aa3f SHA-1: 30dfe79dc13d596ff8e83b00a92e285c7101db64 SHA-256: 20ae0fefe44ffbc76241bb817082d9381704e34b6309ac3de505065df958f4e8
144 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple engines, including ClamAV and a machine learning classifier. Heuristics indicate the presence of JavaScript actions and embedded JS streams, utilizing ASCIIHexDecode and ASCII85Decode filters, which are common indicators of PDF exploits. The ML classifier's high confidence score further supports the malicious nature of the file. While no specific IOCs were extracted, the combination of PDF exploit indicators and high detection scores suggests it's designed to deliver a secondary payload.

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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