Malicious PDF — malware analysis report

Static analysis result for SHA-256 3101e45c345d8aea…

MALICIOUS

PDF

5.2 KB
MD5: 6e08e1e211ae7a6deae9f686cd58b206 SHA-1: 4d816e628d4786b3481a7451c98a3922276e94a4 SHA-256: 3101e45c345d8aea24ca5d26b15e530f5b6a782b78ec80627d9eb03afe17e8c5
114 Risk Score

Malware Insights

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

The critical ClamAV detection and multiple PDF-specific heuristics indicate this file is a malicious PDF exploiting a vulnerability. The presence of PDF_JAVASCRIPT, PDF_JS, and PDF_FROMCHARCODE rules suggests that embedded JavaScript is used to perform malicious actions. The ASCIIHexDecode and ASCII85Decode filters are often used to obfuscate malicious code within PDF files. The JavaScript likely downloads and executes a second-stage payload, as indicated by the exploit nature of the heuristics.

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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