C6 Messenger Downloader PDF malware analysis — malicious · 73ab6fd25050c8fd

MALICIOUS

PDF

267.0 KB Created: 2011-04-16 14:19:34 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))

MD5: 6f729e14b1a9bcdf443d8dc375da7530 SHA-1: ae0885612b9fdf73dc0e02952654f1ef64e049f4 SHA-256: 73ab6fd25050c8fd1b9532c6e3e530fc14065a2efa66f80195af6474a53f0f55

92 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 95%

MITRE ATT&CK

T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for the CVE-2008-2551 exploit, which is known to download and execute payloads. The embedded URL points to a CAB file that likely contains an ActiveX control, and another URL is present that likely hosts the second-stage payload. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9530

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_off000003cd.bin` `80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3CD	73272 bytes

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