Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8ddc02b2a3f500…

MALICIOUS

PDF

14.7 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: 45c287ccb2714f26d487a79f5be98109 SHA-1: 30f2f7877ee2c2f1f697b6a6318581c145fa8cc9 SHA-256: 7a8ddc02b2a3f50024bd3dab0fbef2dd78086e6e4ef776141346089825ab0de1
138 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The file is a PDF document that triggered critical heuristics for ClamAV detection, identifying it as Win.Trojan.Agent-36166. Additionally, low-severity heuristics indicate the presence of embedded JavaScript. This JavaScript is likely responsible for downloading and executing a second-stage payload, which is a common technique for malware delivery. The PDF structure itself does not provide user-facing content, suggesting its primary purpose is to host the malicious script.

Heuristics 5

  • 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
cc37c3dc1f78abae8a70901f79d643db481217e5d5b53a81cc63691e92d2dbd7		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 75923 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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