Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e64b68b920d1e0…

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: 2ff020b0ad18c094333880668ec41555 SHA-1: 69215126e5cb09eb545d491cb2ee70e690dda48e SHA-256: 44e64b68b920d1e0170d57e82e565efe1c32cce93b27c36e2b93dcfba79fe325
136 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. ClamAV detections (Win.Trojan.Agent-36166) confirm its malicious nature. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the critical heuristic firings. The large size of the embedded JavaScript object (75146 bytes) further supports this, indicating complex malicious functionality.

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
27bf4d95d8c45de0dbb32e21cc093cb71352aeb916f61c943c19388774bb4291		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 75146 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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