C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 6dfd8823d6e383e9…

MALICIOUS

PDF

419.0 KB Created: 2011-06-22 16:58:16 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: 74aa0721e44f08ca4c1c97fdebecc0b9 SHA-1: 7d2f7de6af4a5369d9c25490556f45e1ec5fced3 SHA-256: 6dfd8823d6e383e9cb316853c14b9b226ccdf2102947f7dc508d54c5eb5e63df
92 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The PDF file contains a critical heuristic indicating the CVE-2008-2551 exploit, which is known to download and execute payloads. The embedded URL points to a CAB file, and another URL suggests a Windows executable, strongly indicating a downloader functionality. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

Heuristics 2

  • C6 Messenger DownloaderActiveX exploit critical CVE exact CVE_2008_2551
    PDF stream bytes contain HTML/ActiveX content configuring the vulnerable C6 Messenger DownloaderActiveX control with propDownloadUrl and propPostDownloadAction=run. This is the published exploit shape for CVE-2008-2551.
  • 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://artisanballoonz.com/system/system.exe
    • http://c6.community.alice.it/download/DownloaderActiveX.cab#Version=1,0,0,1

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000006e5.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6E5 73272 bytes

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