Malicious PDF — malware analysis report

Static analysis result for SHA-256 01fcc057fa5ca2a8…

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: 9b6013c9f9db4ef3ec0e9bc0aa69a128 SHA-1: e6f1b1f10a11e94868642a99ed4a114422854ab8 SHA-256: 01fcc057fa5ca2a89e048c9a5816ee288e9ceed0f9a54560527f2e68c1eb0d13
168 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malware. Heuristics and ClamAV detection confirm the malicious nature of the file, identifying it as Win.Trojan.Agent-36166. The JavaScript appears to be obfuscated but is likely responsible for downloading and executing a secondary payload, consistent with a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
2a0327835eb7d20af7dca7d69dce23a6f06cd729ae07d1fd6c6e80ee3b52de31		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 75111 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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