C6 Messenger Downloader PDF malware analysis — malicious · 0bf3fcca50825f67

MALICIOUS

PDF

343.8 KB Created: 2011-04-27 02:34:55 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))

MD5: b77a32619192146d245eb30afce587dd SHA-1: 40ebe99a7f2e8e471d279c227bb8406c682f7912 SHA-256: 0bf3fcca50825f67133a8e5c443afd5ab5d157c53853088f1f9c21d65fd32434

92 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 95%

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is identified as malicious due to a critical heuristic firing for the CVE-2008-2551 exploit, which is known to download and execute payloads. The embedded URL 'http://artisanballoonz.com/system/system.exe' likely hosts the second-stage malware. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9841

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_off00000401.bin` `80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x401	73272 bytes

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