Malicious PDF — malware analysis report

Static analysis result for SHA-256 9881067fdb4f7858…

MALICIOUS

PDF

3.6 KB Created: ‹7ÚJ¤]b"üup²„- Authoring application: œnZƒé{#ýiw«†& (via œnZƒé{BbˆgìÕf`äx5@ ¦A8+=)
MD5: 107ea038fca0b465f20438b0c9042d82 SHA-1: f7cee44d8e5898d710283903d1b2faa0506ec482 SHA-256: 9881067fdb4f7858ed4d2b9bc675ebbc2aae0da8b00441eef7c8b2d66c8d312f
86 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript

This PDF sample was flagged as malicious by an ML classifier with high confidence. It contains embedded JavaScript, which is used to encrypt the PDF content and hide an OpenAction, preventing static analysis of the payload. The JavaScript is likely responsible for downloading and executing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.

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