Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdbf9cf8dbdd841…

MALICIOUS

PDF

68.3 KB Created: 2012-10-02 16:53:23 +04:00 Authoring application: jnxvrgo (via squejxu)
MD5: eca1d1abe669754864db35c9943c97c4 SHA-1: b791c872fc6d1dd9b093cca9cf718b29eb8ee959 SHA-256: 8fdbf9cf8dbdd841d951037b2558d81903df65a1663555fbc25465c9a2d8b9ee
92 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The unescape() call suggests obfuscation, and the ML classifier strongly flags this as malicious. The extracted JavaScript files are the primary indicators of malicious activity, likely serving to download and execute further payloads. The document body itself contains no user-readable text, only metadata and obfuscated strings, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits
  • 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.
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • 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_obj0106_000.js
38a1a0cb535bb5c0570ddcaa3791beeda0c27778ad6343ce9073bf57e42bed5d		 pdf-javascript-stream PDF /JS object 106 at offset 0x10F87 207 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
javascript_obj0106_001.js
987b54e0e99aa989807343040594bd02202358d91cf8b96b166e303a5490a1ad		 pdf-javascript-stream PDF /JS object 106 at offset 0x10FA8 368 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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