C6 Messenger Downloader PDF malware analysis — malicious · 7c39d87c69c2df12

MALICIOUS

PDF

228.1 KB Created: 2011-06-22 17:26:18 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))

MD5: 2fab9e71f06a42d7aafddfaf15adf767 SHA-1: c14b9806b5563d484d12b9abdaf1d391235ab2e7 SHA-256: 7c39d87c69c2df1294849aa555a010ffbac50ee45c4f7e4ffdada2140e687dc5

92 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 90%

MITRE ATT&CK

T1203 Exploitation for Client Execution

The PDF file contains a marker for the C6 Messenger DownloaderActiveX exploit (CVE-2008-2551). It also embeds a URL that points to a potential executable payload. The ML classifier also flagged this PDF as malicious with a high probability. The combination of these indicators strongly suggests the file is designed to exploit a vulnerability and download a secondary malicious payload.

Machine Learning

Nyx PDF Classifier malicious score 0.8906

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.

Filename	Kind	Source	Size
`stream_001_off000003be.bin` `80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3BE	73272 bytes

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