C6 Messenger Downloader PDF malware analysis — malicious · 5dbd4a467fdb313e

MALICIOUS

PDF

593.6 KB Created: 2011-05-26 13:33:23 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))

MD5: 888822b86abeb21a800bf15267eb8c1e SHA-1: 26cf4c753945a89337695a7a83ae3b0bd126ea9f SHA-256: 5dbd4a467fdb313e51895423fdeadf58374f278e586b64c8a76c7b7ee9d2a40e

100 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 95%

MITRE ATT&CK

T1203 Exploitation for Client Execution

The PDF sample contains a critical heuristic firing for CVE_2008_2551, indicating it exploits a vulnerability to download a payload. The embedded URL http://artisanballoonz.com/system/system.exe is highly suspicious and likely hosts the second-stage executable. The ML classifier also flagged the PDF as malicious with high confidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9064

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_004_off000010d2.bin` `80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x10D2	73272 bytes

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