Malicious PDF — malware analysis report

Static analysis result for SHA-256 df46b4acd189f0ef…

MALICIOUS

PDF

7.2 KB
MD5: 3f862822891619b0fb9d0d023beb6db5 SHA-1: ef0fc033c84f24d1b0b97acbb3342319f2902e77 SHA-256: df46b4acd189f0ef8c380a48330198ee1be19bf1960e21845bf3d0a091f5fb1e
118 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript that is obfuscated using unescape() calls. The critical heuristic firing indicates exploitation of CVE-2009-4324 via the media.newPlayer object, which is a known method for executing arbitrary code. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, although the exact functionality is obscured. The benign URLs present are standard RDF and Adobe namespace declarations and do not indicate malicious intent.

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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • 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
stream_002_off00000328.js
d0c9e4378a79d03913e444c328a9e5acff68f54433eaed94daa8940a7e30d9df		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x328 2715 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
objstm_0024_00.bin
d9b83294826ddcc64d2240cfb88e3d0d807fdaec0c96859ee556951ef0da5081		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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