Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d102f3ea00f831…

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: 22eff8151edd6b179fb026bd37599082 SHA-1: fdf387a79e90877416f3474c0d8bf7b07ef55268 SHA-256: 20d102f3ea00f831ce8c5c1c94ad805b5089eb7debeb42d1fe7c39d8569409d1
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file was flagged by ClamAV as Win.Trojan.Agent-36166, indicating a known malicious signature. Static analysis also detected embedded JavaScript, suggesting an attempt to execute malicious code. The presence of JavaScript actions and embedded JS streams points towards an attack pattern involving code execution within the PDF document. The exact intent of the JavaScript could not be fully determined due to obfuscation, but its presence is a strong indicator of malicious activity.

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
168a3a45c1ba1b7057e290dbb4ab28fbde0c6cbaf3f432aee4ba0a62f503c7df		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 75113 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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