PDF malware analysis — malicious · e9a31519f5abade6

MALICIOUS

PDF

796 B

MD5: 89c8493e66424eca5eda017690c25a11 SHA-1: a9198e6821cd68e17e2cf8c0aa595f96908f8e11 SHA-256: e9a31519f5abade6e38f820685536f8b6159323688232e50dccce92fed177d80

120 Risk Score

Malware Insights

MITRE ATT&CK

T1059.003 Windows Command Shell T1204.002 Malicious File

The PDF contains a launch action that executes cmd.exe. This command is designed to echo a VBScript payload to a file named 'm.vbs' and then likely execute it. The VBScript payload is obfuscated using string reversal for 'Scripting.FileSystemObject' and concatenates parts of the command. The embedded URL points to 'http://hhyy.info/k4/tmp/m.vbs', which is likely the source of the malicious script. The overall intent is to download and execute a second-stage payload.

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://hhyy.info/k4/tmp/m.vbs

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_pdf_script_0000006f.bin` `ad55c8e83a5896a04b2012c676820daeab2b84cc539e444c6366e79f55a571c5`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x6F	63 bytes

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