Win.Trojan.Agent-36166 — PDF malware analysis

Static analysis result for SHA-256 39bea149f28fde5a…

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: 3b4956e742677bd872fa657b7e3ea7e7 SHA-1: a23078230a926d93e9f2ff261533d616cba89e02 SHA-256: 39bea149f28fde5a6ec01c373beda4f71471a02637efe0c4825462bb77ac1b4c
136 Risk Score

Malware Insights

Win.Trojan.Agent-36166 · confidence 95%

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 confirm this is a malicious file, specifically identified as Win.Trojan.Agent-36166. The embedded JavaScript is likely responsible for executing the malicious payload, leading to the detection of the Windows Trojan. The file's metadata shows it was authored using PDF Library, a common tool for creating PDF documents, but in this case, it was used to deliver malware.

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
fdb37c3dcae97bb487a941c22d51a9b40d27699080759da0083f216a88020e31
pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 75148 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely