Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1a73138a7e5644…

MALICIOUS

PDF

32.3 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: 251955add6e7d97d8f8e7b89d4b2138f SHA-1: 6acca35aed65ec043b825055cc1f4e71a45c2952 SHA-256: 1d1a73138a7e5644a6ab4ef5e1007a3a675ce99de0c8845bef28fbf87c5f86bb
90 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream itself contains an eval() call, suggesting obfuscation and dynamic code execution. The ML classifier also flagged this PDF as malicious with high confidence. The extracted artifact 'javascript_obj0106_000.js' is likely the source of this malicious JavaScript. The primary intent appears to be downloading and executing a second-stage payload.

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 0x7F0B 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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