C6 Messenger Downloader PDF malware analysis — malicious · 046455074c6afe71

MALICIOUS

PDF

358.5 KB Created: 2011-04-22 21:30:58 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))

MD5: 00a91e407c2ce3d67c59128a3c7a9912 SHA-1: 270a503338ce21d2a79f1b665de7eb9832132c65 SHA-256: 046455074c6afe71f02425ce4d154b168ff243886c91163cd0f43c8deda3914f

100 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 95%

MITRE ATT&CK

T1203 Exploitation for Client Execution

The critical heuristic firing for CVE_2008_2551 indicates the exploitation of a known vulnerability in Adobe Reader. This exploit is designed to download and execute a payload from a remote URL. The presence of the URL http://artisanballoonz.com/system/system.exe strongly suggests this is the intended payload, likely a downloader or backdoor.

Machine Learning

Nyx PDF Classifier malicious score 0.9554

Heuristics 3

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.
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
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_off000003af.bin` `80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3AF	73272 bytes

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