Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8106ab3430a367c…

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: c6fd0cd9ed19fff18a2ad7845e0306d5 SHA-1: 37c922d1c21732f80443407ae2962f3f57462f35 SHA-256: d8106ab3430a367c691d744c0ddb5b44574c962ba76606ae07bdf4fe2d7b16dc
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature Win.Trojan.Agent-36166. Static analysis revealed embedded JavaScript within a PDF stream, indicating a potential attempt to execute malicious code. The presence of JavaScript actions and streams strongly suggests the document is designed to exploit vulnerabilities or deliver a secondary payload. The exact functionality of the JavaScript is not fully discernible due to potential obfuscation, but its presence is a critical indicator of malicious intent.

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
defb4aa7378b081a4047d1f91b38973b96dac0b19f7a7bd2af4c51c23f26a083		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74970 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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