Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8aefa1a813a0dfc…

MALICIOUS

PDF

3.1 KB Created: ¿Ç:쉧×M!(ÌT¸)›<dñ Authoring application: ’©m¤Í¾ÖW&=ÖL­hÄ}É3H³»LGŒ
MD5: a87510b5b7d2d39da546051f692795e9 SHA-1: 31345006ba8c5aa90d596f5283429fb342b6896d SHA-256: d8aefa1a813a0dfca31744e91ed2546069395672f2a6d56dabc3154d274aa53d
108 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript

The PDF file is flagged as malicious by ClamAV with the signature Js.Exploit.Shellcode-18. Static analysis revealed embedded JavaScript, and a critical heuristic indicates the PDF is encrypted and carries JavaScript, suggesting the payload is hidden from direct static analysis. This points to an attack pattern where the PDF is used to deliver and execute malicious JavaScript, likely to download and run a second-stage payload.

Heuristics 3

  • ClamAV: Js.Exploit.Shellcode-18 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Js.Exploit.Shellcode-18
  • Encrypted PDF carries /JavaScript — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS
    PDF declares /Encrypt and also references an executable trigger (/JavaScript). 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.

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