Malicious PDF — malware analysis report

Static analysis result for SHA-256 32a5a529c8c1cceb…

MALICIOUS

PDF

15.1 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: 9cf6e5f9cc8829b8ed0b6cd7514838c8 SHA-1: f34434568767be5cf895d03e9199080e40902511 SHA-256: 32a5a529c8c1cceb8ab09af1628804c81f5581d3cc204f3a07dc51d81da713e2
166 Risk Score

Malware Insights

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

The PDF was flagged as malicious by multiple heuristics, including a critical ClamAV detection (Pdf.Dropper.Agent-7246714-0) and a high ML score. The presence of embedded JavaScript and an extracted artifact with a ClamAV detection (Win.Trojan.Agent-36166) strongly indicates that this PDF is designed to act as a dropper for further malicious activity. The embedded JavaScript is likely responsible for downloading and executing the secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Dropper.Agent-7246714-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7246714-0
  • 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
0234a861de6bc0669f373d6abaefcdd578acffa9d6f7e51b1af6ba0793ac45d1		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 83977 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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