PDF malware analysis — malicious · 7d4f0be7201493a3

MALICIOUS

PDF

128.8 KB Authoring application: PyPDF2

MD5: 1a956735570c9f9880951a29514610cc SHA-1: 0b7fc1d3682568e0c5822e547204f778b3df5f4c SHA-256: 7d4f0be7201493a309653424f25fbe97f2dda730d523068fa90bb3ef3fcd75e4

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF sample contains multiple embedded JavaScript streams, with high-confidence heuristics indicating the use of eval() for code execution. The ML classifier also strongly flagged this as malicious. The presence of obfuscated JavaScript suggests an attempt to hide the execution of a downloader or other malicious script. The specific intent of the JavaScript is unclear due to obfuscation, but the use of eval() points to dynamic code execution, likely for payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

Heuristics 4

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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `81af66bf6a5b4dc87ba51a0cac9a9e54b91924140aebf45c9cb40241a4006555`	pdf-javascript-stream	PDF /JS object 4 at offset 0x238	97926 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0004_001.js` `33c87e91d26fae0a8802b3ead187c5756b7e0a178c7a4f7cede083916717a032`	pdf-javascript-stream	PDF /JS object 4 at offset 0x238	96567 bytes
`javascript_obj0096_002.js` `6ec6509be655ad55d7f043dd30a57424b3e40e0dcc056cf0d9c53cf4255c07fb`	pdf-javascript-stream	PDF /JS object 96 at offset 0x1F4F4	808 bytes

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