Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fcbea6ff3c7abb…

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: e5144be42c79b7373fd1ca91bdd10889 SHA-1: d459cdf4d508d8c9651331fb7d6fc7ab1ca04dda SHA-256: a0fcbea6ff3c7abbe2da008d2c575d737f44f3f8c5f6bd2dfcaec29118c1f357
166 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection identifying it as Win.Trojan.Agent-36166. Embedded JavaScript was also detected, suggesting the document's primary purpose is to execute malicious code. The ML classifier output further supports the malicious nature of the file. The specific intent of the JavaScript is not fully discernible due to potential obfuscation, but its presence strongly indicates a downloader or exploit execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
d77e00519317fe342ff74947e6cb79a2ce6a12c9c1461c4fadb1f214c9526ea8
pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74808 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely