Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16d572a151b27bd…

MALICIOUS

PDF

71.0 KB Created: 2012-10-02 16:53:23 +04:00 Authoring application: zqbdhh (via aprpsd)
MD5: ead7bd1dce17d86aa5eb5c6903a4852d SHA-1: 178c53d9d6d9525c2937adf3d306cf64335ea7df SHA-256: d16d572a151b27bd367a864769e3807b476c83ed98e3bfedba8fd73de67f3669
92 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

This PDF contains embedded JavaScript streams, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly flagged this PDF as malicious. The JavaScript appears to be obfuscated, with a high-confidence unescape() call detected. The presence of two extracted JavaScript files suggests an attempt to execute malicious code, likely for downloading and executing a second-stage payload. The document body itself contains no user-readable text, only metadata and obfuscated strings, further supporting a 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
45690351f68df155fe9bb11695c9bc9e2f18b0af6fdbb9539fd7872d6f0b3a0a		 pdf-javascript-stream PDF /JS object 106 at offset 0x11A44 220 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
javascript_obj0106_001.js
79b210261de238f4e219b12bf8e6951eccc80066f65b91f42cda0380c1e0851b		 pdf-javascript-stream PDF /JS object 106 at offset 0x11A68 395 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.