C6 Messenger Downloader PDF malware analysis — malicious · 5b423bb0b997284d

MALICIOUS

PDF

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

MD5: ef5a537ef1b7d6f08090cb62384490a3 SHA-1: 9f5bd69e748ddc449fb213e744da7f21b0349a54 SHA-256: 5b423bb0b997284d0e627c302708680c1158e0d4c10f2dcc6dd7c500296b14b2

92 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 95%

MITRE ATT&CK

T1203 Exploitation for Client Execution

The file is identified as malicious due to a critical heuristic firing for the CVE-2008-2551 exploit, which is known to be used by the C6 Messenger Downloader. This exploit likely facilitates the download of a second-stage payload from the URL http://artisanballoonz.com/system/system.exe. The embedded URL http://c6.community.alice.it/download/DownloaderActiveX.cab is also present, though marked as confirmed benign.

Machine Learning

Nyx PDF Classifier malicious score 0.9562

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_off0000039a.bin` `80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x39A	73272 bytes

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