PDF malware analysis — malicious · f45dd9612f76af3d

MALICIOUS

PDF

796 B

MD5: 2d65b326f593a325bc3b63d3ca1391f1 SHA-1: 030f6c72623d5342e734daa787651fa367889a3d SHA-256: f45dd9612f76af3d660a16bd1f2f0947d05a3a533737d1053028f5b36cec519a

120 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF contains a launch action that executes cmd.exe, which in turn echoes a VBScript payload to a file named 'm.vbs'. This VBScript is then likely executed, downloading a second-stage payload from the embedded URL http://hhyy.info/n6/tmp/m.vbs. The script uses string concatenation and reversal for obfuscation, making full analysis difficult, but the intent to download and execute is clear.

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/n6/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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