Malicious PDF — malware analysis report

Static analysis result for SHA-256 6caa0e1fdb71f8cf…

MALICIOUS

PDF

45.0 KB
MD5: bd83c7cc3a35653fedc59bec37d3d009 SHA-1: 979821a129240e234c6298b69985b63e3116a63f SHA-256: 6caa0e1fdb71f8cf49b323f65c5f534a7df83168d0312f85d56ea4ba8aa9f0ba
166 Risk Score

Malware Insights

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

The PDF file contains multiple embedded JavaScript streams, flagged by heuristics as malicious. The JavaScript appears to be obfuscated but is designed to execute code, likely to download and run a secondary payload. ClamAV detection of 'Pdf.Exploit.Agent-36128' further confirms its malicious nature. The primary attack vector is likely spearphishing attachment, leading to client execution via JavaScript exploitation.

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
a82d56cb7b0642f4b7b32187c32ed1f2a908ca15d7a5b3b54a7f57616be537e3		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
javascript_obj0008_001.js
c2945ae6fe8264bc2bafb8a7df59b211181c0f94a9c123feeaea3430eb9f63e2		 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
20d561576732647e34aa3ec218b61809a3a91c2afcaece44c781fea55f3c097f		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.