Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb44e27e44b4f273…

MALICIOUS

PDF

59.1 KB Created: 2010-04-29 15:11:23 +02:00
MD5: a961f96515ece3af98dcbcb3e8859e4a SHA-1: ae47692a0c76435fa2596a7c270e1a88d3ff590b SHA-256: fb44e27e44b4f273b8aa6bb7b6f455f828ff0768a88c6bcccfee09c3f92d4a5b
300 Risk Score

Malware Insights

MITRE ATT&CK
T1059.003 Windows Command Shell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF contains a critical launch action targeting cmd.exe, indicating an attempt to execute arbitrary commands. This is further supported by ClamAV detections of Win.Trojan.Dropper-133, suggesting the file's purpose is to drop and execute other malware. The embedded script payload and the specific command line observed strongly suggest a downloader or dropper functionality.

Heuristics 7

  • 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 Set fso=CreateObject\("Scripting.FileSystemObject"\' — references a known-dangerous executable (cmd, PowerShell, etc.).
  • ClamAV: Win.Trojan.Dropper-133 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Dropper-133
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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.
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_0003d14d.bin
ab955d3d16568760ac6eefecf1f03231025d5b612e41f3957e668c1ee94f67dd		 pdf-embedded-script PDF decompressed stream script payload at offset 0x3D14D 248960 bytes
Detection
ClamAV: Win.Trojan.Dropper-133
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s).

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