Malicious PDF — malware analysis report

Static analysis result for SHA-256 79aff72f52bddddd…

MALICIOUS

PDF

3.3 KB
MD5: 90aac10e9850e502dd7f2c75c2d459c8 SHA-1: 3fbcce77df13e58b99c58913db6ab432aef6c779 SHA-256: 79aff72f52bddddd38472233eabf197b8abce37244de230c276349fa99270ea5
106 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 that is obfuscated but appears to be designed to download and execute a secondary payload. Heuristics and ClamAV detection confirm the malicious nature of the PDF, likely exploiting a client execution vulnerability. The JavaScript's intent is to download and run further malicious code, as indicated by the ML classifier and ClamAV signature.

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
c589324a87aa9acb124443a06f55810397c3a1bed96f84792003bf1b9413c942		 pdf-javascript-stream PDF /JS object 7 at offset 0xA86 355 bytes

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