PDF malware analysis — malicious · 180149860a8c13d0

MALICIOUS

PDF

7.5 KB

MD5: cbf3c3f396ebf451fda7f3f2720c444d SHA-1: 650a58d18f1d46442463c1b3b1edacc444903040 SHA-256: 180149860a8c13d0d5ca95715ace11d7ca65cc5687a7c0e7b4245a8189add396

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript, which is obfuscated and uses eval() to execute. The JavaScript attempts to decrypt and run code, likely to exploit a client-side vulnerability. The ML classifier strongly indicates maliciousness, and the presence of eval() and fromCharCode heuristics further supports this. No specific family could be identified.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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_obj0004_000.js` `591c77c8b72c2bde3da4900f39bddbb7f5a1b3d02af152368779a82e5988a916`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	298 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_002_off00001c05.js` `d79869401056457eeb11119d737768f101d3701257b3799af8ba80e40e8ab842`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1C05	297 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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