PDF malware analysis — malicious · 16056a7ea4d313a5

MALICIOUS

PDF

5.1 KB

MD5: 23b715eb3462f53af307a16472d99b42 SHA-1: eed660368ed534ed5329f6f723fb1fa197267f8b SHA-256: 16056a7ea4d313a55763c460559c6fb35d1dc8439d9fd841a1efd55c051757e1

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, a common technique for exploiting PDF vulnerabilities. The JavaScript is designed to download and execute a second-stage payload from a remote source. The ML classifier strongly indicates maliciousness, and the combination of JavaScript execution and exploit cluster heuristics points to a downloader or dropper.

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_obj1589_000.js` `7c91b1370616cf2177c7746a84845878deba2f918d9483ae10a8069da9762d96`	pdf-javascript-stream	PDF /JS object 1589 at offset 0x138	8395 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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