Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a123c9db987576e…

MALICIOUS

PDF

3.3 KB
MD5: f47beca31194eb0f017f3d391782a4ba SHA-1: 77e4bad45b22e6f5f0d7434dedbf95aea77b47a8 SHA-256: 4a123c9db987576e53e750d2090464c41c894e3e121cfbf90c1127f25471bad4
106 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript

The PDF file contains embedded JavaScript, as indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. ClamAV detected this as Pdf.Exploit.Agent-36121, and an ML classifier assigned a high maliciousness score. The embedded JavaScript is likely responsible for exploiting a vulnerability within the PDF reader to download and execute a secondary payload.

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
5254e599557d98b9c48f423a4158c783185f0cb6eef0ef080a43b9b1a8782823		 pdf-javascript-stream PDF /JS object 7 at offset 0xA85 273 bytes

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