PDF malware analysis — malicious · 6dcf8cc6164c177b

MALICIOUS

PDF

4.0 KB

MD5: ca5b1ac47b07e1034976a89fee7e2ad7 SHA-1: 0592e9d4002c9292ef673344af51c1a0a86e4e76 SHA-256: 6dcf8cc6164c177b8c239cbfb742014c609a2ced015df56feacfd5600643f3b3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1059 Command and Scripting Interpreter T1203 Exploitation for Client Execution

The PDF file contains obfuscated JavaScript streams that utilize eval() and String.fromCharCode() functions. These scripts are designed to download and execute a secondary payload, as indicated by the 'PDF_JS_EXPLOIT_CLUSTER' heuristic. The ML classifier also strongly suggests malicious intent. No specific family could be identified due to the generic nature of the exploit.

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_obj111611_000.js` `b0d6f693bf5d3c1361b5eda667bd9db7b922c49e0392e46c2b7d6aff6e7bab3f`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	258 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `53b66e1629305fdba96c403689addbd7667a26967bc9bf45eddd4961210e4796`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x268	5514 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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