Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc732f4a920d9868…

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: 3ab484f37b90fba1dd894c470ddb282e SHA-1: cd0e35a1c1684bd422bbd3c24a937b3c1e0d78bb SHA-256: dc732f4a920d986846c531851e761030e05af065ff91eec5aa65e0efa3d7f01f
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 for 'Pdf.Exploit.Agent-16840' and 'Win.Trojan.Agent-36166' strongly suggest malicious intent. 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 functionality cannot be determined due to its obfuscation or truncation.

Heuristics 4

  • ClamAV: Pdf.Exploit.Agent-16840 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-16840
  • 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
a4b784db8a2ffe2e79782badb543ac05d012c9922496b896cefb0d393d52cf1a		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74787 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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