Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8b7fadb49f9a29…

MALICIOUS

PDF

45.0 KB
MD5: adb1f5f396655ffa7a1a76175fce4110 SHA-1: bb5f9b675d20324cb61752e3ed05398bc4c2105d SHA-256: 9a8b7fadb49f9a295f0ffb5407134ef55aaaf8b20c1f3c6533c7a345614a20a4
106 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged by ClamAV as Pdf.Exploit.Agent-36128 and a machine learning classifier indicated a high probability of maliciousness. Embedded JavaScript streams were detected, suggesting the file is designed to exploit a vulnerability and execute arbitrary code. The primary function appears to be the delivery of a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • ClamAV: Pdf.Exploit.Agent-36128 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36128
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
94ec7668d82ab8df27b805c9ca20a71557bf1bba359c839121816719897ba072		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
legacy_pdfkit_stage_000.js
31c4c164cca6a6a6d25a6bd6c91cf31910698f99a614755345fda8246725932d		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

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