PDF malware analysis — malicious · 5c6dcbcc9ee6fdf8

MALICIOUS

PDF

4.8 KB

MD5: 8d2c38bf0a48f70cda4c59d1ddec17cc SHA-1: 7881f874a2f9018fc4f8c886bd830a3f88721ae7 SHA-256: 5c6dcbcc9ee6fdf8f2f63f268a5f86d157c31789a361f45a96e968ba65f94463

288 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 that utilizes eval() and unescape() functions, indicating an attempt to hide malicious code. The JavaScript is designed to execute an exploit, likely for client-side code execution. The presence of PDF JavaScript exploit cluster heuristics and ML classification strongly suggests malicious intent, with the ultimate goal of downloading and executing a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 8

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.
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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)
Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY

Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `72854345ababac0da2bcaa7427c259520e2f148d6d8c705249120ce5e9efd526`	pdf-javascript-stream	PDF /JS object 6 at offset 0x1A3	4155 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`generic_stage_recovery_000.js` `bf6217d6fa48b45286193e374ff1396e579204086c2b166aa3c40e1315d45b05`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 6 at offset 0x1A3	4120 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`generic_stage_recovery_001.js` `d7f751f59f579a23c97b8f54b81506d4a9247999f9b150212b8f51ebf56f18aa`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode from JavaScript object 6 at offset 0x1A3	4118 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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