C6 Messenger Downloader PDF malware analysis — malicious · 0609b81e9a605915

MALICIOUS

PDF

857.8 KB Created: 2011-05-26 13:36:32 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))

MD5: 606de3b8f8a2b9a5696e83cc833fb539 SHA-1: 058bf5cf9f0552c32f0c92d072c188f5d1c56c5b SHA-256: 0609b81e9a605915604bed1af247146c9f4c785c19c2047f7f2bc6548262c44d

92 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 90%

MITRE ATT&CK

T1203 Exploitation for Client Execution

The PDF contains a known exploit (CVE_2008_2551) targeting PDF readers, indicated by a critical heuristic firing. This exploit is designed to download and execute a secondary payload, identified by the URL http://artisanballoonz.com/system/system.exe. The ML classifier also flagged the PDF as malicious with high confidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9396

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_off0000069e.bin` `80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x69E	73272 bytes

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