Malicious PDF — malware analysis report

Static analysis result for SHA-256 4153dab66028a8ad…

MALICIOUS

PDF

639.0 KB Created: A  bg÷Z(KîÎ 3Ï¢{zêdFÚû°·4(‹<þ–ñKWÕC(ßcƒ ì  ³8 Authoring application: ”°?ÝV_˜Ýk­þ.§Ë£h”<$oƘ-=}ŽN‡®y‡ G•"¤œ*š (via 5nD³Aõì?Oó¿¥Èѯ&/ZVœµŒ¼õýÚ³]¨«°Bëð;ÑzUf)
MD5: c7c5611cccb2f3ec8c632cf5545f3fd7 SHA-1: 995927d7f981403f7af48722a1752dd7993400fd SHA-256: 4153dab66028a8ad9c7993f036a6c25902b53f925d3650f527ef8cd712c4f24d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript

The PDF was flagged as malicious by a machine learning classifier and exhibits several high-severity heuristic firings, including PDF_ENCRYPTED_WITH_JS and ML_NYX_PDF_MALICIOUS. The presence of JavaScript actions and embedded JS streams, combined with encryption, indicates an attempt to conceal malicious code execution. The document body is unreadable, suggesting the content is obfuscated or dynamically generated by the script.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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.
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.

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