PDF malware analysis — malicious · 86bf14c4c7146577

MALICIOUS

PDF

10.5 KB

MD5: 2b1bad47319d431a4e762f5317461367 SHA-1: 6052d39059b14d0695f1c6095432d62ae7a1cfe5 SHA-256: 86bf14c4c7146577d5e7cb7c92efd4462a9a9fc5bf770818d23894a2cd07c058

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1553.005 Mark-of-the-Web Bypass

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flags this PDF as malicious. The presence of an unescape() call suggests obfuscation, and an extracted JavaScript file was also noted. The primary attack pattern involves the execution of this embedded JavaScript, likely to download and execute a second-stage payload or perform other malicious actions.

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` `1be510e5207c65d43fed5b080071f4d2d0a5e6f3b7d84c1664f3466825abf427`	pdf-javascript-stream	PDF /JS object 7 at offset 0x233	46780 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 239 eval/decoder/string-building token(s).

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