PDF malware analysis — malicious · 1b787394c1e941f4

MALICIOUS

PDF

244.6 KB

MD5: fed841323b8a8377eea778c7373e2ead SHA-1: 4db916649b20b92bac40e7517c607b244cbd2e2f SHA-256: 1b787394c1e941f4aba4560319e775f5937b80b0cf6a002a39c6cde9493f5329

210 Risk Score

Malware Insights

MITRE ATT&CK

T1059.003 Windows Command Shell T1204.002 Malicious File

The PDF contains a launch action that executes cmd.exe with parameters designed to create and run a script. This script is likely intended to download and execute a second-stage payload. The ML classifier strongly indicates maliciousness, and the PDF launch action targeting cmd.exe is a critical indicator of compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 4

Launch action critical PDF_LAUNCH

PDF contains a /Launch action whose target is an executable, URL, or UNC path — can start an external application
/Launch action target: cmd.exe critical PDF_LAUNCH_COMMAND

PDF /Launch action specifies an executable target with parameters '/c echo Set fso=CreateObject("Scripting.FileSystemObject"' — references a known-dangerous executable (cmd, PowerShell, etc.).
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.
Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_pdf_script_0003cc93.bin` `3871464e13411c750c3476c2de761dfe84f057f42b79b9613c8072d253258465`	pdf-embedded-script	PDF raw stream script payload at offset 0x3CC93	248960 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s).

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