Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c011eb46a25dd4…

MALICIOUS

PDF

18.25 MB
MD5: b5261ec00fdbf8e7a3f2b217189d9667 SHA-1: bae08183ed1fc84ee815c7a22f8c3160d4a61016 SHA-256: 54c011eb46a25dd43079c5d329db30feea1aaa28fce632d1bd662d65569cc12b
114 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF file exhibits multiple indicators of malicious JavaScript, including embedded JS streams and JavaScript used in conjunction with encryption. This suggests the document is designed to obfuscate its true malicious intent and likely execute a secondary payload. The ML classifier strongly supports a malicious verdict. Due to the obfuscation, the exact nature of the payload and its delivery mechanism cannot be definitively determined.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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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