Malicious PDF — malware analysis report

Static analysis result for SHA-256 c469962f04e2f1c4…

MALICIOUS

PDF

49.2 KB Created: 2009-11-08 15:58:45 +03:00 Authoring application: tendChunk (via d348d11f7f80d82e49a05e3c2269d373)
MD5: f805bfedcd841de706dd5fdbcb724af8 SHA-1: 10bf6d76d3aeaf54e75ade5c058fdd0cee1f5e82 SHA-256: c469962f04e2f1c45b4cfd0332fdd6abaa6989cdcc6a4163a9d3d7485793b2fb
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript with eval() calls, indicating an attempt to execute malicious code. The ML classifier and ClamAV detection strongly suggest this is a malicious exploit. The presence of JavaScript actions and embedded JS streams, combined with the high ML score and ClamAV detection (Pdf.Exploit.Agent-4228), points to a PDF exploit. The specific exploit mechanism is not fully detailed in the provided evidence, but the overall pattern is consistent with a code execution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Exploit.Agent-4228 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-4228
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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.
  • Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT
    Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0019_000.js
91afe78a46f5396892d41604a015709e4046f203d870ea824f33eebac6d6c3dd		 pdf-javascript-stream PDF /JS object 19 at offset 0x2FD9 4096 bytes
javascript_obj0020_001.js
27cad6d5226ad8e59976e8b12fc109cb1fcb0da6d4d17771f1e1e9fb94edad7e		 pdf-javascript-stream PDF /JS object 20 at offset 0xBE7E 41 bytes

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