PDF malware analysis — malicious · 2130225dca859ab2

MALICIOUS

PDF

796 B

MD5: a1dfef9a7dac8b14052b56af79a99c4c SHA-1: 27d1b238799bcc570f22cc96ca66609be1e95f69 SHA-256: 2130225dca859ab2e3c7afabdaf7cbc301998f05a8d10ca6b3bade8fb4048eb4

120 Risk Score

Malware Insights

MITRE ATT&CK

T1059.003 Windows Command Shell T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF contains a launch action that executes cmd.exe. This command attempts to create a VBScript file named 'm.vbs' by echoing a string that, when decoded, reconstructs the necessary COM objects and file system operations. The script is designed to download and execute a second-stage payload from the URL http://tjkd.info/f2/tmp/m.vbs. The embedded script payload and launch action strongly indicate a malicious intent to deliver further malware.

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://tjkd.info/f2/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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