C6 Messenger Downloader PDF malware analysis — malicious · 853e62a55b75d2a3

MALICIOUS

PDF

872.0 KB Created: 2011-04-22 21:50:24 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))

MD5: 16be9e8fcd3122ff46a751e36a077672 SHA-1: 60f84badada04d6438f758c5e75bb095cbe39ec1 SHA-256: 853e62a55b75d2a3ca081a994f15d3bc03a9623813623fd363a9d9f74705df1a

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 as malicious by an ML classifier and contains a heuristic indicating an exploit for CVE-2008-2551, known as the C6 Messenger DownloaderActiveX exploit. This exploit is designed to download and execute a second-stage payload, indicated by the presence of the URL http://artisanballoonz.com/system/system.exe. The benign URL is also listed for completeness.

Machine Learning

Nyx PDF Classifier malicious score 0.9750

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_002_off000007b9.bin` `80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x7B9	73272 bytes

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