C6 Messenger Downloader PDF malware analysis — malicious · 6a3e5b2202cce304

MALICIOUS

PDF

330.3 KB Created: 2011-05-28 19:58:30 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))

MD5: f31d34bfceaca0a68cc633422fc5c0e8 SHA-1: 40f156304cbe78ef133a157875c290149069f78c SHA-256: 6a3e5b2202cce304c9b2dd6c9f988735d595869475b1f82af7206872cef9d849

92 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 95%

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is identified as malicious by a machine learning classifier and contains a marker for the CVE-2008-2551 exploit. This exploit is known to download and execute a secondary payload, indicated by the embedded URL pointing to 'system.exe'. The PDF's structure and the exploit type suggest it's a downloader for further malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9673

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_off000003db.bin` `80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3DB	73272 bytes

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