PDF malware analysis — malicious · 5c262458afa70418

MALICIOUS

PDF

662 B

MD5: 5cec725f20079ff23d662abbad0a0c0c SHA-1: 2f14e4daaf661c0f58a4b0c767fd6648b8afd333 SHA-256: 5c262458afa70418a4f84ece025bd908f6ad8fb795d47b1029010b8fb6d26050

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that utilizes the unescape function, a common indicator of obfuscation and potential exploit code. The critical PDF JavaScript exploit cluster heuristic further supports this. While the exact payload is not discernible due to the obfuscation and lack of specific strings, the script's purpose is to execute malicious code, likely leading to further compromise. The file is classified as malicious with a high risk score.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

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
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `050d5d813fa2ee8519d168886ea79abc671e87c09a28230733a15ffaf0197099`	pdf-javascript-stream	PDF /JS object 6 at offset 0x167	47 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0006_001.js` `196fb4858fcd14687f63b7e2387a27f14d1dac703adf312c70df524fb558279a`	pdf-javascript-stream	PDF /JS object 6 at offset 0x188	270 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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