Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8815b7e74d1c52…

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: ef277c484a2f99d6ecd3af286a74b275 SHA-1: 3a068aa1ca16212f0623d1daecb972d05bc8902c SHA-256: 4e8815b7e74d1c524f5a51a5b8de25294bdb87796a132e2fa1c6e723e719383d
104 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and exhibits several high-severity heuristic firings, including PDF_ENCRYPTED_WITH_JS and PDF_JAVASCRIPT. The encryption combined with JavaScript indicates an attempt to conceal malicious code, likely for downloading and executing a second-stage payload. The presence of XFA forms and embedded files further supports a complex malicious structure.

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.

Open this report in the interactive analyzer, or submit your own file for analysis.