PDF malware analysis — malicious · 02cdcd65753d9bea

MALICIOUS

PDF

15.1 KB

MD5: 5e41c91544d84be51d0d687ec0449361 SHA-1: b55c2a6c26a56902268661f4e1647ab6541ad86c SHA-256: 02cdcd65753d9bea05e9927eda4164f8081d29616ae6a60752ebe30381fed844

156 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicative of obfuscated malicious code. The JavaScript is designed to download and execute a second-stage payload, as suggested by the 'PDF JavaScript exploit cluster' heuristic and the presence of deobfuscated JavaScript streams. 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` `a43ea4e308f8fddc36c53a120b059940883c71e02f0c96ec7ea3b73cdd780535`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	304 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` `c7c34e75074d1a9b4e27e09d4d22882e483b81ddbe8d1decf1ee440dfc55208d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x190F	12133 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` `638f0e4be9d0a5f821a11bba9cdfb017d6e252f2f3bf5786cddafd54f9666893`	deobfuscated-js	nested inline base-23 callee-key decoded JavaScript at offset 0x190F	4685 bytes

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