Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aad60074e1fc4a6…

MALICIOUS

PDF

32.4 KB Created: 2012-08-07 10:10:40 +04:00 Authoring application: Adobe Acrobat 7.0 (via Adobe Acrobat 7.0 Image Conversion Plug-in)
MD5: 17bab1a8673b1658ca1a3acf6dcf9085 SHA-1: 2c2e7c6138b41261ecf2353b5ded6c4fe8c8dcbe SHA-256: 4aad60074e1fc4a61d5ced32bb0192a573ab64cae1bb657ac0f43b6740f91d95
88 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The presence of an eval() call within the JavaScript stream (PDF_EVAL) strongly suggests code execution. The ML classifier also identified this PDF as malicious with high confidence. The extracted artifact 'javascript_obj0106_000.js' is likely the source of the malicious JavaScript. The primary intent appears to be downloading and executing a second-stage payload, though the exact URL or execution method is not directly extractable from the provided evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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_obj0106_000.js
e60ffdebe11306e77bcf9401ab0aba802de323a0ea579514081c2a66307c06fe		 pdf-javascript-stream PDF /JS object 106 at offset 0x7F1F 658 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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