Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8ebbb17a0a0b59…

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: 9f3b77ddce1cd4eb3d2e1432e9434a1f SHA-1: b09ac82685f8c9af7a750c16f968fc31125f4bb8 SHA-256: 7b8ebbb17a0a0b595172986f0769159bb20af89c253e1d19289a3161961982ec
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings. ClamAV detections for 'Win.Trojan.Agent-36166' on both the main file and an extracted artifact strongly suggest malicious intent. The JavaScript is likely responsible for executing the payload, as suggested by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristic rules. The exact behavior of the script could not be fully determined due to its nature, but the overall pattern points to a malicious PDF dropper.

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
1a92f1f5d9110106737d4e444673bfc90fdafa35a86f9f52f459e03722bed120		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74322 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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