PDF malware analysis — malicious · be54579eca46aa7e

MALICIOUS

PDF

10.5 KB

MD5: 15319697e50a1944e12314d17a4322df SHA-1: ff2e2b119f9e0da395c51b84f5013c25e211103e SHA-256: be54579eca46aa7ea3fdea17fdf95407cf4a45a0800a496c0c3021a92c3f8b3f

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1559.001 Component Object Model Hijacking

The PDF document contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly flags this PDF as malicious. The JavaScript stream, identified as 'javascript_obj0007_000.js', is likely responsible for the malicious behavior, potentially downloading and executing a second-stage payload. The use of unescape() further suggests obfuscation of malicious JavaScript code.

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` `32e7c3be08fb2c8634928db3f57f6330890c6bf15ec3aeb36e6b738592f2cca0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x233	46556 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 245 eval/decoder/string-building token(s).

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