Malicious PDF — malware analysis report

Static analysis result for SHA-256 507705ce55ece611…

MALICIOUS

PDF

5.2 KB
MD5: 31d049a8431159ba4b16b6e186f0c3b6 SHA-1: 04e6fe8fafe4125a58a48ed4b8778c247dbe3671 SHA-256: 507705ce55ece61115c406fa70761f3aed5270a2af05c6250184c41609105f18
144 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, specifically identified as Pdf.Exploit.Agent-36178. Heuristics indicate the presence of JavaScript and the use of PDF filters like ASCIIHexDecode and ASCII85Decode, which are commonly employed in exploit delivery. The differential parser failure suggests obfuscation techniques were used to hinder analysis. The primary attack vector appears to be exploiting PDF vulnerabilities to 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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