PDF malware analysis — malicious · 6f4852c1f489e3de

MALICIOUS

PDF

23.3 KB

MD5: dc9ddd95fd93e79270f06132c8b21177 SHA-1: 77e9c0e963ee1f08d3a82f46b2285d25fb3c78e2 SHA-256: 6f4852c1f489e3de9cd72729678c00040c3b054313023f25554fbf67b2f6fbcc

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript

The PDF file contains obfuscated JavaScript that, when deobfuscated, appears to download and execute a second-stage payload. The heuristics indicate a PDF JavaScript exploit cluster and generic stage recovery, suggesting a downloader or dropper functionality. The exact nature of the payload and its ultimate destination could not be determined due to the obfuscation and truncated nature of the script.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 6

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)
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_obj0009_000.js` `acf82334d11727c31f34c634d1aaf6106e013dd65884db4e494f00568cc6b568`	pdf-javascript-stream	PDF /JS object 9 at offset 0xD6	21380 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` `05c41bf3ac53cc3611ec87d6b88de04ed37d5584e92f17fb8dbae2176e4e6bf4`	deobfuscated-js	generic stage recovery percent-decode -> percent-decode from JavaScript object 9 at offset 0xD6	15314 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`generic_stage_recovery_001.js` `b17d06a65d3cb75b1552caae340dfcc26bdee7e68ef94938d553b8b336295d44`	deobfuscated-js	generic stage recovery percent-decode -> percent-decode -> percent-decode from JavaScript object 9 at offset 0xD6	15308 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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