Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73a0876f37754db…

MALICIOUS

PDF

28.28 MB
MD5: 2e4eecfb60263baa707d9f31dacebbe3 SHA-1: 7b5dcd361452b66ca9c202c52352f27b673400cf SHA-256: b73a0876f37754db5e967bec9841b86f7aa53362a1be700fedf1d3e62e2e91db
114 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1566.002 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

The PDF file contains embedded JavaScript and is encrypted using JavaScript, indicating an attempt to hide malicious content. Heuristics suggest the use of ASCIIHexDecode filters, often employed in exploit delivery. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it's designed to deliver a hidden payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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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