Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bd898e5ab1d063…

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: ccd5bbc61cafac20ea8a8e170a763552 SHA-1: 27dc751f4435dec50da70fb9fdbf08c60f956de1 SHA-256: f8bd898e5ab1d063d716aa71816e6cb748f69b06abfe8a10e59ce7f6a56eccef
136 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. ClamAV detection confirms this is malicious, specifically identifying it as Win.Trojan.Agent-36166. The embedded JavaScript is likely responsible for exploiting a vulnerability within the PDF reader to download and execute a secondary payload, although the exact script content could not be fully analyzed due to its size and potential obfuscation.

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
6f9abc6cbb25cf95c949aa37c83846b5eddbb8481da5a46d458bdd6256e67a8a		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74399 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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