PDF / .BIN malware analysis — malicious · 18e447f2e5744ce8

MALICIOUS

PDF / .BIN

2.6 KB

MD5: 8f12bdd163c17ad164504a9dbe6f9f40 SHA-1: 8391d4fe7e5cc4492bb14b26d49fcc5eb68433bc SHA-256: 18e447f2e5744ce864af462cc28c5b0f94d6399926e9ffbdbcd7a36fa14ced60

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript that utilizes eval() and String.fromCharCode() for obfuscation and execution. This 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 specific family could be identified, but the behavior is consistent with a downloader or initial access 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` `31a13f1d14aef5c75618be16b03a37c1b63a31d5b30a4283a513c2d6aeff9c6e`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	259 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `9f0982785549531ad682f10bb4474cd663039173a3c62811d4cce3cd22433321`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x26A	3328 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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