Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e2bd21552fb360…

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: 660efd4047a7f66ef70b2c4a4954ca6f SHA-1: 51013b74764b74ed80d86b7463da5880602852e9 SHA-256: 23e2bd21552fb360d8d8c13ab7747b820985d1e69a6dbfc78c92b2d2d1707cb6
136 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV with the signature Win.Trojan.Agent-36166. Static analysis revealed embedded JavaScript, indicating an attempt to execute code within the document. This JavaScript is likely responsible for downloading and executing a second-stage payload, a common technique for malware delivery. The presence of JavaScript actions and embedded JS streams strongly suggests this malicious behavior.

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
004a73df348ffb7aac1a3ceb6ad443c74004a5b3e0ffd333f5144cf117ffc946		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74599 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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