Malicious PDF — malware analysis report

Static analysis result for SHA-256 c980b1a96466fbac…

MALICIOUS

PDF

14.6 KB Created: 2008-11-11 18:43:15 +01:00 Authoring application: Acrobat Editor 8.0 (via Adobe Acrobat 8.1.0)
MD5: 0f6af57c8ba2b3cdd9593223ca38e2de SHA-1: 93044e9484357e0de6c4dd618ded8beb2e43f878 SHA-256: c980b1a96466fbac57199c0e22be2a833bd0b07614c37da0d2834693939c8962
128 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.007 JavaScript

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_UNESCAPE. The ML classifier strongly flagged this PDF as malicious. The JavaScript appears to be obfuscated and uses eval() and unescape() functions, typical for downloading and executing further malicious content. No specific family could be identified, but the attack pattern is consistent with a PDF-based downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (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.
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0025_000.js
be4aa50cbd241740c393f55fdd2bdc8a61666e122e989a9ec82dc98c4212b4e2		 pdf-javascript-stream PDF /JS object 25 at offset 0x5FD 44 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
legacy_pdfkit_stage_000.js
7a61b8045eef8660fcf9fdb991c88bdc240149a28db0dd32f572fd26414f9f64		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x7B7 568 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).

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