Malicious PDF — malware analysis report

Static analysis result for SHA-256 60f9e19eac131358…

MALICIOUS

PDF

45.0 KB
MD5: 84da5fd8e52db23d1231ecbf2380e446 SHA-1: 1c8801e16ce362936e71596d03c838041bb9e7ef SHA-256: 60f9e19eac13135854dd5bbb6cf89c8ea0cd21480280c613dda9b09f5ac9a7e8
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, flagged by multiple heuristics and ClamAV as malicious (Pdf.Exploit.Agent-36128). The JavaScript appears to be heavily obfuscated but is designed to execute code, likely downloading a second-stage payload. The presence of JavaScript and the exploit detection strongly suggest an attack pattern involving client-side exploitation via a malicious document.

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
03686b21c80e807fc6c2802d07b4339063d518972ebbc06336a6c5c1c9230dad		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
javascript_obj0008_001.js
4b3963fce9b294b710f87c496c22a45ba4a8715e6c27f1a17497fd46df23c017		 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
8bbaede8e54840d144e2f95d83656c2b468756c54bcf5d9ff7b370617d1c4f32		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

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