Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac73e45b6999b80d…

MALICIOUS

PDF

66.2 KB Created: 2012-10-02 16:53:23 +04:00 Authoring application: bhvtrcw (via wmacomx)
MD5: 76d1765a8852f7bd5afc48ac1f44881c SHA-1: 5a222f6247850939b8654bcb958a10dbab263c6e SHA-256: ac73e45b6999b80dc1958f5a2e1f9f8327aa47c60a15b3bd5d8522fb603f4181
60 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 JavaScript stream is obfuscated, as suggested by the PDF_UNESCAPE firing and the 'Script obfuscation indicators' in the static triage. The primary function of this script appears to be downloading and executing a second-stage payload from a remote source, which is a common technique for malware delivery. No specific family could be identified due to the obfuscation.

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
1d4d051cc9abd8aef595d0b0226329fe306f7273739c1043d42a275d0b628b04		 pdf-javascript-stream PDF /JS object 106 at offset 0x10729 210 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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