C6 Messenger Downloader PDF malware analysis — malicious · 1858dd59e2966d83

MALICIOUS

PDF

284.4 KB Created: 2011-05-26 13:42:56 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))

MD5: 7942366ae55986af3116aae68b342c38 SHA-1: 7d05ee9766798ef900e0eeae20de78a56b87692d SHA-256: 1858dd59e2966d8349d700a33dadd30972640b48cac3ad6a4a6a3240a99b678f

92 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 95%

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is identified as malicious due to a critical heuristic firing for the CVE-2008-2551 exploit, which is known to facilitate the download of additional malware. The embedded URL 'http://artisanballoonz.com/system/system.exe' likely serves as the second-stage payload. The heuristic 'ML_NYX_PDF_MALICIOUS' further supports the malicious classification.

Machine Learning

Nyx PDF Classifier malicious score 0.9470

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_off000003d4.bin` `80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3D4	73272 bytes

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