Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3c025a248e865b…

MALICIOUS

PDF

31.7 KB Created: ­*d\ušt«á4ó$‚ÿò€ÀY‹p Authoring application: ïV/DØDúÓ`Ãh² ÃÆ (via ïV<DØDðÓeÃi²¬ÃÑíE)
MD5: 286812881f8741ddcce15129b2d4a6af SHA-1: 4489feda277e519ca66d06bc0f9ec12be5ab8cd3 SHA-256: ab3c025a248e865bb6322ab75efbf0315670ccc98eb45bd0606f2b8e978fb58f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier with high confidence. It contains embedded JavaScript, which is used to encrypt the document and hide the payload. The JavaScript action is likely responsible for downloading and executing a second-stage payload, though the exact mechanism is obscured by the encryption. The presence of JavaScript within an encrypted PDF strongly suggests a malicious intent to bypass static analysis and deliver harmful content.

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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0009_000.js
10cc6c101790c5c64b8359c13b37fc933921cf3cb344836228013421e5a1a11d		 pdf-javascript-stream PDF /JS object 9 at offset 0x3CE 29818 bytes

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