Malicious PDF — malware analysis report

Static analysis result for SHA-256 85706771e01e7fd4…

MALICIOUS

PDF

14.4 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: d08dd9c21c26ba44b0d834f6d6d2207a SHA-1: cfcf75345e2eaaa547a81de4e484fa2e9e09fbbc SHA-256: 85706771e01e7fd44a243d2df0618394c0a79412e060735409aee3cc5cb76266
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript

The file is identified as a malicious PDF by ClamAV, specifically as Win.Trojan.Agent-36166. Static analysis detected embedded JavaScript, indicating an attempt to exploit PDF vulnerabilities. The JavaScript stream is large and complex, suggesting it is responsible for the malicious payload delivery or execution. The exact behavior of the script could not be fully determined due to its size and potential obfuscation, but its presence alongside the ClamAV detection strongly suggests 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
bf5d4967d5e83e68d9f17091e920b698e2bfddb3f5159f385ee2620b59d08c4e		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 75096 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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