Malicious PDF — malware analysis report

Static analysis result for SHA-256 063248b6b2de1ff8…

MALICIOUS

PDF

3.14 MB Created: 2010-07-04 01:30:00 +02:00 Authoring application: 376377000P000D000F000C000r000e000a000t000o000r000 000V000e000r000s000i000o000n000 0001000.0000000.0000 (via GPL Ghostscript 8.71)
MD5: 62f8b917115316f62b9955e57eb8f6e7 SHA-1: c772befb01649f42e4d943052362207d336a1303 SHA-256: 063248b6b2de1ff806d8a03c31e2da437f925919d03da7df3d42fe13021f7076
292 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 Visual Basic T1105 Ingress Tool Transfer

The PDF contains embedded JavaScript that leverages a known vulnerability (CVE-2010-1240) to execute cmd.exe. This command then creates a VBScript file named 'vbs1.vbs' which uses ADODB.Stream to download and execute a second-stage payload. The embedded script also contains a URL that is likely used for this download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • Adobe Reader Launch action VBS dropper command chain critical CVE likely CVE_2010_1240_LAUNCH_VBS_DROPPER
    PDF uses a CVE-2010-1240-style Launch action: cmd.exe is invoked from /Launch and builds a VBS stage that uses ADODB.Stream, MSXML2.XMLHTTP, or FileSystemObject to write or execute a payload.
  • Launch action critical PDF_LAUNCH
    PDF contains a /Launch action whose target is an executable, URL, or UNC path — can start an external application
  • /Launch action target: cmd.exe critical PDF_LAUNCH_COMMAND
    PDF /Launch action specifies an executable target with parameters '/c echo Dim BinaryStream > vbs1.vbs && echo Set BinaryStream = CreateObject("ADODB.Stream"' — references a known-dangerous executable (cmd, PowerShell, etc.).
  • Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
  • PDF JavaScript WScript downloader high PDF_JS_WSCRIPT_DOWNLOADER
    Decoded PDF JavaScript reconstructs a Windows Script Host COM downloader using WScript.CreateObject plus XMLHTTP/ADODB.Stream style download, write, and run behavior. This is commodity payload delivery rather than a specific PDF parser CVE trigger.
  • 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://www.meduniwien.ac.at/homepage/content/webmail-login-fuer-mitarbeiter-der-
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000c61.bin
96fd48b6a723f88343bd7e9627daf63180d0ef23a327cd4a3ae61fa8486c5a7f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC61 32392 bytes
embedded_pdf_script_00005086.bin
40abd21cc16d7f47deccc3a181fad013ee9391fed16bacfc36cd3459490f7ecc		 pdf-embedded-script PDF decompressed stream script payload at offset 0x5086 90 bytes

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