Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae6a2f4c5c344350…

MALICIOUS

PDF

37.7 KB Created: (aŠ “zPö®ÙöZ©iòw¡Pn£ Authoring application: ’ßSù=ÑJQ`¡³èê hí (via ’ßSê=ÑJ[`¤³éê¬húB°)
MD5: 96a5e955bfbe670553b1ba4eb9afa1ca SHA-1: c595df3c4bb5907e215baf34156debfdc7c04ef1 SHA-256: ae6a2f4c5c34435028f3ee048b1d2089ed625738791bd083d66e6ee5fc50bb9d
64 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript

The PDF file is flagged as malicious and contains embedded JavaScript, which is also used to encrypt the document. This suggests the JavaScript is used to obfuscate or deliver the malicious payload. The large size of the embedded JavaScript stream (35958 bytes) further indicates it likely contains significant malicious code. The file's SHA256 hash is included as an IOC.

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
2d5a715dc5b5dc47c0bdcd099119e1ca92422db880df044ca21d1c5ede7fcd2a		 pdf-javascript-stream PDF /JS object 9 at offset 0x3CD 35958 bytes

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