PDF malware analysis — malicious · 458acec3b86983b3

MALICIOUS

PDF

1.9 KB

MD5: fcffaa5b36928d8e0509da1cd0bc0a8f SHA-1: e3113d9dbb42477e5343ed09d4416bb53fb1ecf6 SHA-256: 458acec3b86983b39a2c7ee3b3f4415fc9da3ba2247a6e86f9c3d92d5e5a0aa7

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059.007 Command and Scripting Interpreter: JavaScript/TypeScript

The PDF document contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The presence of high-severity firings for PDF_EVAL and PDF_UNESCAPE indicates that the JavaScript is likely obfuscated and uses potentially malicious functions to execute code. The ML classifier strongly supports a malicious verdict. The primary attack vector appears to be the execution of this embedded, obfuscated JavaScript.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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_obj0004_000.js` `175537e5828f191d5236ec2a35058da77c61951f5bb571347cc5b2342dc0b851`	pdf-javascript-stream	PDF /JS object 4 at offset 0x94	1309 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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