Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df8d640bed65940…

MALICIOUS

PDF

31.3 KB Created: ²‹ÍóhNS¹⽎ø=Žv1 þ Authoring application: Nÿ Â*~óéÓÿ¼¯ M (via NÿÂ*~ óìÓþ¼£ Z:Ì)
MD5: 445c1dc271ad339d975f24cde68c4024 SHA-1: 438faffbb06c03e56c70a13940b82ed5d5af482d SHA-256: 9df8d640bed65940853130fdf0119268859a6b514cf2706923c5a846d3f20b58
64 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file is encrypted and contains embedded JavaScript, a common technique to hide malicious payloads from static analysis. The heuristics indicate that the JavaScript is used in conjunction with the encryption, suggesting it's part of the obfuscation or delivery mechanism. The embedded JavaScript stream is large, implying complex functionality, likely for downloading and executing a secondary payload.

Heuristics 4

  • Encrypted PDF carries /JavaScript — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS
    PDF declares /Encrypt and also references an executable trigger (/JavaScript). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
  • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0009_000.js
55cae4ef7c422349ab2d397a75ff2025c03a674aa1a9fc0c40304dd3a8d89c0e		 pdf-javascript-stream PDF /JS object 9 at offset 0x3BC 29492 bytes

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