Malicious PDF — malware analysis report

Static analysis result for SHA-256 dabf8a57dd3edba1…

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: 3cc5c4036811c9b90bfe81c6f8082d34 SHA-1: bda1d74229a23b63391d97cbb4e7e53213f73cc9 SHA-256: dabf8a57dd3edba1ad359f43e2ef3d588c7820ccc3adf8b4851e1f66d06d0c42
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 an attempt to execute code. The presence of JavaScript actions and embedded JS streams strongly suggests the file is designed to download and execute a second-stage payload. The exact nature of the payload is not discernible from the provided evidence, but the overall pattern points to a downloader or 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
8764367e6baf1b1b2b0b0e80e83efa57751906e07ccc79a7a1c5b51cc0d8e715		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74777 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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