PDF malware analysis — malicious · 6236de5372cbdbf8

MALICIOUS

PDF

1.5 KB

MD5: 3bae848eacb69d63140f6732247ebbea SHA-1: 870b348c3de24f8884e925f69cc006f1cb54fe2d SHA-256: 6236de5372cbdbf8f1303c5c7f59029fca908bbfc1190fc255007cd2f032a344

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file contains obfuscated JavaScript, identified by multiple heuristics including PDF_JAVASCRIPT and PDF_JS_EXPLOIT_CLUSTER. The JavaScript, when deobfuscated, appears to construct a URL for downloading a second-stage payload. The ML classifier strongly indicates maliciousness. The primary attack vector is likely spearphishing attachment, leading to client execution via a PDF exploit.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111111_000.js` `70d3f111c2e644e3014c839eecbf33c3c255093207abe5423bb646db5173b67d`	pdf-javascript-stream	PDF /JS object 111111 at offset 0x160	2214 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`javascript_obj111112_001.js` `1f1bd5e171c66634a16ab4d88915753f4c7a2c55d1d0cad9bd75099c6bdd5bcb`	pdf-javascript-stream	PDF /JS object 111112 at offset 0x54A	65 bytes

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