Malicious PDF — malware analysis report

Static analysis result for SHA-256 851fcf75de176342…

MALICIOUS

PDF

66.2 KB Created: 2012-10-02 16:53:23 +04:00 Authoring application: xdiheoq (via huqdyh)
MD5: e04d2e933c014a7900645159a739f743 SHA-1: d72df20d4db0c1ec7e28ea31814d224df1fb6fef SHA-256: 851fcf75de1763424d63592d6991764094aee7f6c8c8e64120e2d61943aba9bd
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 unescape() function call suggests obfuscation, a common technique for malicious scripts. The ML classifier strongly flagged this PDF as malicious. The extracted JavaScript files, javascript_obj0106_000.js and javascript_obj0106_001.js, are likely responsible for executing the malicious payload, potentially by downloading additional content from a remote source.

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
46b149beb8910ce93c83a32c05e75344889ea36ae6b15117e9a994ac1151415d		 pdf-javascript-stream PDF /JS object 106 at offset 0x10727 212 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
javascript_obj0106_001.js
fb855084c5734c2dcc75a9c3af7cacdecc967e3b183a9ed2d68b2c20afb8c377		 pdf-javascript-stream PDF /JS object 106 at offset 0x1074B 387 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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