PDF malware analysis — malicious · 652c7e207f42526f

MALICIOUS

PDF

5.1 KB

MD5: b7f421627e3bb4f2eb1886090992c169 SHA-1: f81222e9e1f67ab31b7dbc4130024ce33fb92b29 SHA-256: 652c7e207f42526fe26ebd61c96a8063e5358be399d57615f2dadfebe6626ae0

156 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains obfuscated JavaScript that utilizes eval() and String.fromCharCode() to execute arbitrary code. The script is designed to download and execute a second-stage payload, as indicated by the PDF_JS_EXPLOIT_CLUSTER heuristic. The ML classifier strongly flags this PDF as malicious. No document body text was available for analysis, but the script's behavior is clear.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj8614_000.js` `528def1df61131ec2c70d937c20caf8b4392949285ef57a164ce3fbd79e643be`	pdf-javascript-stream	PDF /JS object 8614 at offset 0x138	8351 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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