PDF malware analysis — malicious · 0e440bf4df502a79

MALICIOUS

PDF

15.8 KB

MD5: 146fd96b5770e5515b453e3b3da604b4 SHA-1: 525e124c5042fe3d4d3da4253ac4ccad9d5ed1b8 SHA-256: 0e440bf4df502a798684251acc0aaeb2977ff659da652b857a30423ecf6a5c0e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that is heavily obfuscated and utilizes eval() and String.fromCharCode() for execution. This script is designed to download and execute a second-stage payload, as indicated by the 'PDF JavaScript exploit cluster' heuristic and the presence of multiple JavaScript files. The ML classifier strongly flags this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `7c67e4cb4a67112af380f488e8baaa9f8004a7be77b1aef4c61e8c88566af8c4`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	311 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `d0b0151f0adf895cf797ea99de18d4139284f215cc286977d7e81076a327ca1c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1A4A	12719 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `c0380b0ba43a21e6261cc70142d227a9d1c5505c6328644b44ad780e2a7dea3b`	deobfuscated-js	nested inline base-23 callee-key decoded JavaScript at offset 0x1A4A	4969 bytes

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