Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f75b14fb94276cc…

MALICIOUS

PDF

44.9 KB Created: 2009-09-16 10:55:28 +08:00 Authoring application: Acrobat PDFMaker 7.0 for Word (via Acrobat Distiller 7.0 (Windows))
MD5: 79aa823b0b800f3af7bd5d609c314efd SHA-1: 66ba07f151a7dc8c8084f289b280f34d4af1c036 SHA-256: 3f75b14fb94276cc3ebd58d73039379f6b8a00e255f43352a0b6d340489c4a5b
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

This PDF document contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The critical finding of 'CVE_2009_4324' suggests the exploitation of a known vulnerability in PDF readers via the media.newPlayer object. The embedded JavaScript, though obfuscated, is likely responsible for downloading and executing a second-stage payload, which is a common technique for malware delivery. No specific family could be identified.

Heuristics 6

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (matched in decompressed stream)
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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.
  • 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/pdf/1.3/
    • http://ns.adobe.com/pdfx/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/photoshop/1.0/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0019_000.js
02921a777c88b2aef9284d9d24a367174ef196328fc1b313e898882bb6440b39		 pdf-javascript-stream PDF /JS object 19 at offset 0x50B 2597 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
js_property_alias_stage_000.js
e98893b24d5fbdcddb743b3fb8afa36a1a200653972ab5a7601d4b3b83cde0cc		 deobfuscated-js JavaScript hex-escape property alias normalized stage at offset 0x50B 2573 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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