C6 Messenger Downloader PDF malware analysis — malicious · 78fc8c466fc969e2

MALICIOUS

PDF

314.9 KB Created: 2011-04-22 21:51:48 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))

MD5: c46f4689186fb6c686534ee4a2faf165 SHA-1: 70e382415809d6938271f7ca88d9188767dc5984 SHA-256: 78fc8c466fc969e2f3158227942df3dad887135daedb1b0086b811e7f88e127a

92 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 95%

MITRE ATT&CK

T1203 Exploitation for Client Execution

The PDF exploits CVE-2008-2551 via an ActiveX control to download a CAB file, which likely contains a second-stage executable. The embedded URL 'http://artisanballoonz.com/system/system.exe' is highly suspicious and is the likely destination for the downloaded payload. The ML classifier also strongly indicates maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9529

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_off00000810.bin` `80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x810	73272 bytes

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