C6 Messenger DownloaderActiveX PDF malware analysis — malicious · 6615fcc1cb560d82

MALICIOUS

PDF

313.3 KB Created: 2011-04-22 21:32:53 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))

MD5: f2a264b65091d8bb3135def0d8739901 SHA-1: 38b397885055e9d509cec01978a95692d57efbb3 SHA-256: 6615fcc1cb560d8215fbb8f751b0d21c9673f3cd2078cbedcd594b4d421d3293

92 Risk Score

Malware Insights

C6 Messenger DownloaderActiveX · confidence 95%

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is a malicious PDF that exploits CVE-2008-2551, a known vulnerability related to ActiveX controls. It contains an embedded URL pointing to a CAB file, which likely contains a DownloaderActiveX exploit. A second URL, http://artisanballoonz.com/system/system.exe, is also present and is likely the location of the second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9561

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_off000004f3.bin` `80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4F3	73272 bytes

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