Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a47744d95958a55…

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: 5121772f2ed170a6169ab7f14568f73d SHA-1: 82d3393d1f093e29808c52bd82d2bdfc88702277 SHA-256: 9a47744d95958a5593454273d2d0f6b8cb96206775056e76846f13f80a119215
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The file is a PDF containing embedded JavaScript, flagged by heuristics as a potential attack vector. ClamAV detections indicate it is a known trojan. The embedded JavaScript, though large, is likely responsible for downloading and executing a second-stage payload, contributing to the malicious classification. The specific nature of the JavaScript's execution is not fully discernible due to its size and potential obfuscation, leading to a moderate confidence score.

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
f195b432cd63421121181a0dc14e7b8f66c3f6004a79b13482407e413b577c42		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 75134 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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