Malicious PDF — malware analysis report

Static analysis result for SHA-256 c510a2b2fd5752ec…

MALICIOUS

PDF

14.5 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: 9363efde3fde320a4ee5a35d93fa2d4f SHA-1: 9f5b4befb1c1dcd99f82bb42ce90777ce4ea5ec1 SHA-256: c510a2b2fd5752ec4075b89a3ed0ca2d978ad82205203b4f1ced32c39da0a30f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature Win.Trojan.Agent-36166. Static analysis detected embedded JavaScript, indicating a potential for malicious script execution. The presence of JavaScript actions and streams strongly suggests that the PDF is designed to deliver a secondary payload, likely a trojan downloader. The document body is unreadable, but the heuristics and ClamAV detection point to a malicious intent.

Heuristics 4

  • ClamAV: Win.Trojan.Agent-36166 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36166
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
a9c475f21bb813b266757da6c914f272db3ef7d43bccd078bc6be0ddca64544f		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 75171 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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