Malicious PDF — malware analysis report

Static analysis result for SHA-256 2859a8b40f6cf629…

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: 45d52800eeb1721bb5d1fb454e013967 SHA-1: 699146a4166a079eb70b3c579095485074511dd0 SHA-256: 2859a8b40f6cf629496a63a36e0e304bcf7d29fcec1e6841d48a604d3189ccfa
136 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV with the signature Win.Trojan.Agent-36166. Static analysis revealed embedded JavaScript, indicating a likely attack pattern involving the execution of malicious code. The JavaScript's purpose is presumed to be downloading and executing a second-stage payload, which is a common technique for malware delivery. The confidence is high due to the strong ClamAV detection and the presence of executable JavaScript.

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
d2938982a782de655882d3815d73b20b66ae02d6b42fa92cae20cdaefaec498f		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 75145 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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