Malicious PDF — malware analysis report

Static analysis result for SHA-256 21deca25c522c6fc…

MALICIOUS

PDF

788.1 KB
MD5: 701e3f3973e8a8a7fcec5f8902ecbfd9 SHA-1: 40acd0ad155864068578bce931bd822afc67c314 SHA-256: 21deca25c522c6fcfae6653d030e94d613f5252cca62f85d20118bcfc3b79d9a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged by ClamAV as Pdf.Dropper.Agent-7238533-0, indicating it is a dropper. Heuristics indicate the presence of JavaScript and that the PDF is encrypted with JavaScript, suggesting the malicious content is hidden and executed via script. The ML classifier also strongly indicated maliciousness. The primary function appears to be downloading and executing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Dropper.Agent-7238533-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7238533-0
  • Encrypted PDF carries /OpenAction — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS
    PDF declares /Encrypt and also references an executable trigger (/OpenAction). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic

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