Malicious PDF — malware analysis report

Static analysis result for SHA-256 b249fa7a4e288ec5…

MALICIOUS

PDF

14.3 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: 8d50555f2223e6134ada111c26febd16 SHA-1: a03e0669f0e696dd6e036a53e17fb19a6be99e38 SHA-256: b249fa7a4e288ec50aa82dd1f731f87b44741e1410161638a9bec2cc3057e7e8
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file was flagged by ClamAV as Win.Trojan.Agent-36166, indicating a known malicious signature. Heuristics indicate the presence of JavaScript within the PDF, suggesting an attempt to execute code. This JavaScript likely serves to download and execute a second-stage payload, a common technique for malware delivery.

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
aaa484ba162935f518e847593dd2b19bf88a42d217d63421d86b8a80163269bb
pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74274 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely