Malicious PDF — malware analysis report

Static analysis result for SHA-256 7caa4956a591f819…

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: 107318ef30f323692f7ea0e3a31a3ae0 SHA-1: fb06cc20f39aa7d8efddb0e019416b2a5d79b761 SHA-256: 7caa4956a591f8193df008b858e9c6c7f94b497f7e9987ca7a701e506097a3c7
88 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream is obfuscated and utilizes an eval() call, indicating an attempt to hide malicious code execution. The primary function appears to be downloading and executing a second-stage payload, as suggested by the heuristic firings and the presence of a suspicious JavaScript object. The document body is truncated and unreadable, providing no further context.

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 0x7F05 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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