Malicious PDF — malware analysis report

Static analysis result for SHA-256 92fe70026bb1c048…

MALICIOUS

PDF

10.9 KB Created: 2008-11-06 00:56:42 +01:00 Authoring application: Acrobat Editor 8.0 (via Adobe Acrobat 8.1.0)
MD5: 23f31c83ee658bb5c2635befde56199a SHA-1: 59c6f7c2deb08e361b041d6ea9ebeca4dfde6091 SHA-256: 92fe70026bb1c0482d7fcd5fe9b2f597d6befd4f91dbdd819be0088a68e02d00
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

This PDF document contains embedded JavaScript that utilizes eval() and unescape() functions, indicating obfuscated code execution. The ML classifier strongly flags this PDF as malicious. The presence of two extracted JavaScript files, 'javascript_obj0027_001.js' and 'javascript_obj0038_002.js', further supports the malicious nature. The script's likely intent is to download and execute a second-stage payload, although the exact URL or payload is not directly visible in the provided evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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)
  • Suspicious extracted artifact medium 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.
  • 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 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_obj0027_001.js
2421e756c6aab3a2f5833e5c46c68de6971fcc738338d4f6cabe67c5aa559f96		 pdf-javascript-stream PDF /JS object 27 at offset 0x623 5355 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
javascript_obj0038_002.js
59e6f07394791c2a51623ff44edd453e73cc54eba1001d393679a6f39bc22c5d		 pdf-javascript-stream PDF /JS object 38 at offset 0xE26 5296 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).

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