MALICIOUS
230
Risk Score
Malware Insights
MITRE ATT&CK
T1059.007 JavaScript
T1203 Exploitation for Client Execution
T1566.001 Spearphishing Attachment
The PDF file contains a critical PDF_LAUNCH heuristic firing, indicating an attempt to execute a command. The embedded script uses JavaScript to construct and execute a VBScript file named 'launcher.vbs' which is likely responsible for downloading and executing a second-stage payload. The script also references 'exec.pdf' and 'script.vbs', suggesting a multi-stage infection process.
Machine Learning
- Nyx PDF Classifier malicious score 0.9999
Heuristics 4
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Launch action critical PDF_LAUNCHPDF contains a /Launch action whose target is an executable, URL, or UNC path — can start an external application
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/Launch action target: cmd.exe critical PDF_LAUNCH_COMMANDPDF /Launch action specifies an executable target with parameters '/C echo Set fso=CreateObject\("Scripting.FileSystemObject"\' — references a known-dangerous executable (cmd, PowerShell, etc.).
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OpenAction trigger high PDF_OPENACTIONPDF has an /OpenAction that launches, submits, or opens an external target
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Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOADPDF 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.
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
embedded_pdf_script_00000068.binb289cef1c6d42db57796e339d06e228f2bab7a9d886548cdd581dd767028015d |
pdf-embedded-script | PDF decompressed stream script payload at offset 0x68 | 552 bytes |
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