Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60b9fb5d9cafbe6…

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: 35db7737d577b11620984d4321e6b8cd SHA-1: 89476065f897b2668342bf726bdd1bb18968b605 SHA-256: a60b9fb5d9cafbe60d290e8ba747e0434875491271d7e64393a80a0fb5ae4fa3
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. Static analysis also detected embedded JavaScript, suggesting an attempt to execute code within the PDF. The presence of JavaScript actions and streams points towards a common delivery mechanism for malware. The exact intent of the JavaScript could not be fully determined due to its nature, but it is highly probable that it is used to download and execute a second-stage payload.

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
816219a1a05a9b989eefc901fc20eb51068832199ee91fae86db22f7780ec4c2		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 75008 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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