Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad12a054851de84…

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: 871c0c57b91cdc832054a4fd6912dc7e SHA-1: 61b4e12ae8268cabcc085d1fadf51bb1d593605a SHA-256: dad12a054851de847a9ebd6e42e0d87ffe4294618065b0fff9b7d017af8a2dc8
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, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. This JavaScript is likely responsible for executing the malicious payload. The embedded artifact is a JavaScript file, further supporting this. The exact behavior of the script could not be determined due to obfuscation, but its presence strongly suggests a malware delivery mechanism.

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
7825471d25d3feb6462ac5fdfb6beb8354233a1783daa4a13e34691170c7628f		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 75142 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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