PDF malware analysis — malicious · 5e7a677f45edf70d

MALICIOUS

PDF

107.4 KB Authoring application: PyPDF2

MD5: 2eeb6ab4297f847edfe64aa99d6a6280 SHA-1: fb84506b96b01e5a244e41269cbbc69176edf8c4 SHA-256: 5e7a677f45edf70da2dd0d639a986f1f62bc7fbbd6a64a2bfe11ab06cbaa3ae3

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample contains embedded JavaScript streams that are heavily obfuscated and utilize eval() calls, indicating malicious intent. The ML classifier and exploit cluster heuristics strongly suggest this is a PDF JavaScript exploit. The primary function of the JavaScript appears to be downloading and executing a secondary payload, as evidenced by the obfuscated code and the presence of multiple large JavaScript objects.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

Heuristics 5

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
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.
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_obj0021_000.js` `efc38f91191900971c32e082a462ebfeb69bef3325d4270aae77af50507792d6`	pdf-javascript-stream	PDF /JS object 21 at offset 0x881	80517 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0021_001.js` `c51e614ff820a48d739c764e381c0770194d8633f7e9952c0607314f5c42ea13`	pdf-javascript-stream	PDF /JS object 21 at offset 0x881	80394 bytes

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