Malicious PDF — malware analysis report

Static analysis result for SHA-256 853e7f38730949ed…

MALICIOUS

PDF

45.0 KB
MD5: c9a21a9ad6a70b06646d19a13aa0b3d2 SHA-1: b8481e7eb57430e5a5c706326461106050bc38fc SHA-256: 853e7f38730949eda6783b7c9a08f30396d2cda7844d24e80538e6c54be1e11f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript streams, flagged by multiple heuristics and ClamAV as malicious (Pdf.Exploit.Agent-36128). The JavaScript appears to be obfuscated but is designed to execute code, likely downloading and running a second-stage payload. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Exploit.Agent-36128 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36128
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
f645d3cfa92d234ff8a880cb4eb30e984a4b10979296b7aabac7f794686a59e0		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
javascript_obj0008_001.js
6e88559593dc3946972732e180d6ce1d738f33b6e69485061b1eddf16aa7b119		 pdf-javascript-stream PDF /JS object 8 at offset 0x20A 45555 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36128
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
ed61240a0f481c080b8e11ca94a6309fc38f132089c6cd275e6b84a2afde93ea		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

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