C6 Messenger Downloader PDF malware analysis — malicious · 0930aed871198205

MALICIOUS

PDF

352.3 KB Created: 2011-05-26 13:14:30 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))

MD5: 0ba093d5291e667873bb5e3efa0d0c24 SHA-1: 6b5ecb1f92607a0bc05a5fdeb512d286beb3b75d SHA-256: 0930aed8711982058674d038d89364ab113a4aac2e8f081380b9d1ffebe985fc

92 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 95%

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is a PDF file flagged by multiple heuristics, including a critical alert for the CVE-2008-2551 exploit. This exploit is known to download and execute a second-stage payload. The embedded URL 'http://artisanballoonz.com/system/system.exe' likely hosts this payload, indicating a downloader attack pattern. The ML classifier also strongly suggests maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9685

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_off00000961.bin` `80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x961	73272 bytes

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