C6 Messenger Downloader PDF malware analysis — malicious · 76b58b546e1b5e24

MALICIOUS

PDF

946.5 KB Created: 2011-04-22 21:17:28 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))

MD5: 0c92429389595cf2ef99eb30291d9e0b SHA-1: 61ae649fc4d23daad200fdbb1a6e675a993ca0f9 SHA-256: 76b58b546e1b5e249b0e1e40dd79fc98c9cee127ce0423b9c49399a9e9544906

92 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 90%

MITRE ATT&CK

T1203 Exploitation for Client Execution

The PDF contains a marker for the CVE-2008-2551 exploit, which is known to download and execute additional payloads. The embedded URL 'http://artisanballoonz.com/system/system.exe' is highly suspicious and likely the second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9160

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_003_off0000123d.bin` `80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x123D	73272 bytes

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