Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f5aea51f908b5c…

MALICIOUS

PDF

801 B
MD5: 529cefcbd7edc66307395ac5bfad721f SHA-1: 4d914d28d2fbe80d88e3a504660e8244fdbbeb3c SHA-256: b7f5aea51f908b5cc18b5fbb7d2a610b3e5614cc432e55c862cec9997b304742
120 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The PDF file contains a launch action that executes 'cmd.exe' with parameters designed to echo a VBScript to a file named 'm.vbs'. This script is then likely executed, downloading a second-stage payload from the embedded URL http://piokliand.com/car/tmp/m.vbs. The embedded script payload heuristic and the PDF launch command heuristic strongly indicate this malicious behavior.

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://piokliand.com/car/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