Malicious PDF — malware analysis report

Static analysis result for SHA-256 051d6141ec9bf592…

MALICIOUS

PDF

33.8 KB Created: ¼W±3åçT¯§†‹¬bœÏ?¶á°ÒF Authoring application: Åye§םõ·Ì™;/Ù (via ÅyeÑ§× ð·Í™7/Îä})
MD5: f912b62e4fcc72cf8cd0608a0c7beed0 SHA-1: 805637605d6856eaba029caa4f49dbb2061788cb SHA-256: 051d6141ec9bf5927a0a26f0db2d55b42b6cf59424b7b41cd81c4cfa50da0e2a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and heuristics indicating the presence of hidden JavaScript. The embedded JavaScript streams, particularly the larger one, are heavily obfuscated but appear to be designed to execute further malicious code. The PDF's encryption in conjunction with JavaScript suggests an attempt to conceal the payload from static analysis, a common technique for malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT
    Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
d74656742849bf9e85151f5f3c10d8cac0065b49c5e5d22e5a3808bead373df2		 pdf-javascript-stream PDF /JS object 8 at offset 0x4EE 2047 bytes
javascript_obj0009_000.js
a216853399f1fdf6ea340b1afd390f6fc22640a8c2768af767b002ea9d861573		 pdf-javascript-stream PDF /JS object 9 at offset 0x3BB 31910 bytes

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