Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed7cdc675e35ca2…

MALICIOUS

PDF

216.3 KB Created: 2008-08-11 02:17:08 -07:00 Authoring application: Acrobat Editor 8.0 (via Adobe Acrobat 8.0)
MD5: 127de6d54d6390b5f86eb29312dd84e0 SHA-1: 21b853653f102b3caa0717e352ed18d71f92151a SHA-256: 3ed7cdc675e35ca2d31097957ddf3477aa7301f7a48abc3f42fb083b84743731
104 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1105 Ingress Tool Transfer

The PDF file was flagged by a machine learning classifier as malicious and contains embedded JavaScript. The JavaScript stream exhibits obfuscation and uses eval() and String.fromCharCode(), indicating it is likely designed to download and execute a second-stage payload. The presence of a suspicious extracted JavaScript file further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0032_000.js
4c28625ef345674363904161c282d151204bbe31754f0e0b27d569e4a497669c		 pdf-javascript-stream PDF /JS object 32 at offset 0x7DE 3778 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).

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