Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e6f0c50c3249759…

MALICIOUS

PDF

5.2 KB
MD5: bbcd4855fa3be0c616aec1e1ef712a7d SHA-1: aee8e8d5ba844fd84dea939ffb99b34dabcd4038 SHA-256: 1e6f0c50c3249759b8ab32ad3c1f38ac461d3f19955f5a42ea6d75eb6ce20abc
144 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and a machine learning classifier, specifically as 'Pdf.Exploit.Agent-36178'. Static analysis detected embedded JavaScript and the use of PDF filters like ASCIIHexDecode and ASCII85Decode, which are often associated with exploit delivery. The presence of JavaScript actions and streams strongly suggests the document is designed to exploit a vulnerability and execute malicious code.

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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