Malicious PDF — malware analysis report

Static analysis result for SHA-256 2753f17daebc01e7…

MALICIOUS

PDF

68.0 KB Created: 2012-10-02 16:53:23 +04:00 Authoring application: gyajsai (via mtfxhu)
MD5: 2b36bcc01d5ea4d0621e4e79a35dbb57 SHA-1: ecb53d4ac2149d558137e4fe8e9b30d177a71fab SHA-256: 2753f17daebc01e70397301a81f5eeeafec4a1b31af0c8873855bc559bbc1786
92 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

This PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML_NYX_PDF_MALICIOUS classifier strongly suggests malicious intent. The JavaScript stream is obfuscated, but the presence of unescape() calls and extracted JS files points to code execution. The likely purpose is to download and execute a second-stage payload, as suggested by the 'Suspicious extracted artifact' heuristic. 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0106_000.js
3adcfea59e513c3edd166e0c97626e26a20a94cc63dcafa2bb49b4eaa6aeb580		 pdf-javascript-stream PDF /JS object 106 at offset 0x10E51 210 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
javascript_obj0106_001.js
0ca11f42b2150dd9973bea0668d458e2e6a1b0d5c1ccd3a1179615096125a8c0		 pdf-javascript-stream PDF /JS object 106 at offset 0x10E75 385 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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