PDF malware analysis — malicious · 4997089b39a1dccd

MALICIOUS

PDF

10.2 KB

MD5: 1b59ae498fafb4d62da6684c3f092b13 SHA-1: 6cce6e929b1cb276251c3352558b039c8ed98838 SHA-256: 4997089b39a1dccd41bc8dc925319649206565ae9bc0c51544223270f781b699

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged by a machine learning classifier as malicious and contains embedded JavaScript. The JavaScript stream is obfuscated and uses the unescape() function, indicating it is likely designed to download and execute a second-stage payload. The presence of JavaScript actions and embedded JS streams points to T1059.001 and T1059.005.

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_obj0007_000.js` `1870947e480cd920ab74c6e5075c382b6eeab3f4109261a47e97695b819379cd`	pdf-javascript-stream	PDF /JS object 7 at offset 0x233	46430 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 223 eval/decoder/string-building token(s).

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