Malicious PDF — malware analysis report

Static analysis result for SHA-256 70bb49335246b8d2…

MALICIOUS

PDF

3.3 KB
MD5: c51d1c60bec36022c5e7301f431e1a0f SHA-1: 032e69455bde15170aa4ace3562ccbf17eacb516 SHA-256: 70bb49335246b8d2d7199bc5002645012aa3edc30ce077c669205390b96583d5
106 Risk Score

Malware Insights

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

The file is a PDF containing embedded JavaScript. The JavaScript code decodes a string from the PDF's title property and then executes it. This suggests the PDF is designed to exploit a vulnerability and download a secondary payload, as indicated by the ClamAV detection and ML classifier. The specific payload URL is not directly visible, but the overall pattern is consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • ClamAV: Pdf.Exploit.Agent-36121 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36121
  • 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
fca5b129e16ae541ad5f442f60022c5bfb5b2a866ff927b91a79e8d8c38c48b4		 pdf-javascript-stream PDF /JS object 7 at offset 0xA86 356 bytes

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