C6 Messenger Downloader PDF malware analysis — malicious · 659ce5b0827c1359

MALICIOUS

PDF

188.4 KB Created: 2011-06-22 16:20:59 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))

MD5: acd6a0aeb54727a00ec2a69922b21cb4 SHA-1: 5c73d7ed47e4776a6e1599b1a61e4e8cad4884de SHA-256: 659ce5b0827c1359172d9fa7c310dfd545dbeb10aa2e551298894b74aa1e5fe9

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 contains a critical heuristic firing for the CVE-2008-2551 exploit. This exploit is known to download and execute a second-stage payload. The embedded URL http://artisanballoonz.com/system/system.exe is highly suspicious and likely hosts the payload.

Machine Learning

Nyx PDF Classifier malicious score 0.8879

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_off000003f7.bin` `80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3F7	73272 bytes

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