PDF malware analysis — malicious · 2240026e5e526245

MALICIOUS

PDF

11.0 KB

MD5: b14b4ee313c9d913ee5f7ab60d3d963b SHA-1: f0eb08ece42732817e1b5ce0ec98399bbc47d1cf SHA-256: 2240026e5e52624522cd48ba35766940c7606051793ae27472d6ba7b1938784d

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded, obfuscated JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly flags this PDF as malicious. The unescape() function is used, suggesting an attempt to deobfuscate malicious code. The primary function of the embedded JavaScript appears to be downloading and executing a secondary payload, as evidenced by the ML_NYX_PDF_MALICIOUS heuristic and the presence of a suspicious JavaScript file. The exact URL or execution command is not directly reconstructible due to obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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_obj0007_000.js` `482a2d8bae6929a82388f5958b4d3bca894294435d9bba521c12e651e3b72435`	pdf-javascript-stream	PDF /JS object 7 at offset 0x233	47910 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 269 eval/decoder/string-building token(s).

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