Malicious PDF — malware analysis report

Static analysis result for SHA-256 25da67093c69968a…

MALICIOUS

PDF

67.8 KB Created: 2012-10-02 16:53:23 +04:00 Authoring application: exsncn (via scsvbvx)
MD5: bab9746ad1e740e63605a75cdb896373 SHA-1: e93f7cf56909659fde22667754e0a18accc51525 SHA-256: 25da67093c69968a7e058afb3d4b19e903c08f420074f457f2ad0764d966f175
90 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

This PDF contains embedded JavaScript which is obfuscated and uses an unescape function, indicating malicious intent. The ML classifier strongly flagged this PDF as malicious. The presence of JavaScript and the ML classification suggest the document is designed to execute arbitrary code, likely to download and run a second-stage payload. No specific family could be identified.

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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0106_000.js
448a0f9b2206343d2a0c17ca041df9ee64fd743ddb9649258d175567f9562574		 pdf-javascript-stream PDF /JS object 106 at offset 0x10D88 205 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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