PDF malware analysis — malicious · 760cdfb92d3ebfab

MALICIOUS

PDF

2.7 KB

MD5: d9505b19fb877608afe7bbea116fff0f SHA-1: 2e02da461a1795565e5f518a7fcbdc50256cda8c SHA-256: 760cdfb92d3ebfab1471687502e7a9ce23f1353f03050e00ee92d9c4036fe9d9

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 using String.fromCharCode and eval() calls. This JavaScript is designed to decode and execute further malicious code, strongly indicating its role as a downloader for a second-stage payload. The ML classifier and exploit cluster heuristics confirm the malicious nature of the embedded script.

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_obj111711_000.js` `e48208a08d63b6aa41bfd4d6634a63db82038f699d464d43b1b006fb8dcb293e`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	2522 bytes
`javascript_obj111712_001.js` `de6164a598c13479e0d74c61634829d247ec95b6b68bfee29d5ca75f0c33bb52`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x8BA	537 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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