Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eb7dd778fcad231…

MALICIOUS

PDF

20.44 MB
MD5: a9357e294f91d90c9f96b2bca94c6871 SHA-1: 825b3463a8d4607cda3777cb30db7982b85ae9f2 SHA-256: 0eb7dd778fcad231fcb9e1ce7d980bd69b027784e12a70d0b49e9044b1a49f1f
114 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

This PDF file was flagged as malicious by an ML classifier and exhibits multiple heuristic firings related to embedded JavaScript and encryption. The presence of PDF_ENCRYPTED_WITH_JS indicates that JavaScript is used to hide the malicious content, suggesting an attempt to evade static analysis. The JavaScript action and embedded JS stream point towards the execution of malicious code, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • 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.
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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.
  • Additional-actions dictionary low PDF_AA
    PDF defines /AA (Additional Actions) that references an executable action (JS/JavaScript/Launch/SubmitForm) — can auto-trigger on document or widget events. Form-field calc/format/validate/keystroke handlers in legitimate interactive forms commonly fire this, so it is reported as a low-weight signal; weaponised auto-execution is flagged by stronger rules (PDF_OPENACTION, encrypted-with-JS, etc.)

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