Malicious PDF — malware analysis report

Static analysis result for SHA-256 7461cf5ff3137493…

MALICIOUS

PDF

849.0 KB Created: 2011-05-26 13:11:56 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: 8460a89b2553e2a4731de6aae001e080 SHA-1: 41d94259d8f2e4f9ac8fb79a95a14adcf49aa5c0 SHA-256: 7461cf5ff313749306f38a2bf39e78298a19afd69c0e2df1c4f8081940679a71
152 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a malicious PDF that exploits the CVE-2008-2551 vulnerability. It contains a URL pointing to a secondary executable payload, indicating it functions as a downloader. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9531

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.
  • ClamAV: Pdf.Dropper.Agent-7426447-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7426447-0
  • 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.

FilenameKindSourceSize
stream_001_off00000418.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x418 73272 bytes

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