PDF malware analysis — malicious · 800ac30a6840de3e

MALICIOUS

PDF

6.7 KB

MD5: 165c34a8eff7557344e04ff5d3c12e66 SHA-1: d2f3847db8fcd555f0876fe8af403b6d5ef7d4f7 SHA-256: 800ac30a6840de3ef7cc9e737669cb8bd2a3a0773dd53ffccc72266c85f39987

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly suggests maliciousness. The unescape() function call within the JavaScript is a common technique for deobfuscating malicious code. While the exact script functionality is not fully detailed, its presence and obfuscation suggest it's designed to download and execute a second-stage payload. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious classification.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Suspicious extracted artifact info 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
`javascript_obj0009_000.js` `056102870f5c190b97045e3a0d7ccb39853e2100e178622ab22ed9287cec59f4`	pdf-javascript-stream	PDF /JS object 9 at offset 0xD6	5983 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).

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