Malicious PDF — malware analysis report

Static analysis result for SHA-256 c851e4f6af2e4422…

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: 24bbd70d295b8f3e088ba218185d5520 SHA-1: e099891f5a6b6ea3566afacfee1716798d3c3a07 SHA-256: c851e4f6af2e44223740dc5c423e2a63f71f1ed52c736e658d21a8236a868652
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. ClamAV detections (Win.Trojan.Agent-36166) confirm the malicious nature of the file. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, which is a common technique for malware delivery. The specific JavaScript content was too large to fully analyze but the heuristics and ClamAV detection strongly suggest 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
1cb4d22c088f18a1d8204c9a9d70908c613902ca4f58cf0f3db18163fed1a71d		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 75334 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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