C6 Messenger Downloader PDF malware analysis — malicious · 5a57508bd441da8c

MALICIOUS

PDF

334.8 KB Created: 2011-07-07 22:54:58 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))

MD5: 372ef26a7e987c3d6c3f390102ae4c56 SHA-1: 33129fb09403c7c1a0ce33bd7ce0bf7140fd7f04 SHA-256: 5a57508bd441da8c5cedd2d45ef1a7b0ab5d82f56b516b06c8cc9bba9287891f

92 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 95%

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is identified as malicious by an ML classifier and contains a critical heuristic firing for the CVE-2008-2551 exploit. This exploit is known to download and execute a secondary payload, indicated by the embedded URL pointing to 'system.exe'. The PDF's structure and the exploit type suggest it's a downloader for further malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9673

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_off00000420.bin` `80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x420	73272 bytes

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