C6 Messenger Downloader PDF malware analysis — malicious · 0e5185c110f5837e

MALICIOUS

PDF

284.4 KB Created: 2011-04-13 09:11:42 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))

MD5: 19b42f70f9b734cea284782300a0e2e5 SHA-1: 8c156bbdf654c4dd8e5051c2213ee5fbc02b2aa7 SHA-256: 0e5185c110f5837eb3e81e5348614d4e36e04103d19927e765c990a6dd421bcf

92 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 95%

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ML classifiers and heuristic rules, specifically flagging the CVE-2008-2551 exploit. This exploit is known to download and execute a second-stage payload, indicated by the embedded URL pointing to 'system.exe'. The presence of the DownloaderActiveX.cab URL further supports the downloader functionality.

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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