PDF malware analysis — malicious · 86eae6ae04886750

MALICIOUS

PDF

115.7 KB

MD5: 9b03d73dd1f0a6abe0218308c2965765 SHA-1: 8b54a39a0293aa93ca24000bf4fd4118d23266d9 SHA-256: 86eae6ae04886750f9b03aa33cce9e276c918b6a91e9a1fd7450d611cf745f1d

148 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript streams that are heavily obfuscated. The JavaScript utilizes a custom base64 decoding function and the unescape() function, indicating an attempt to hide malicious code. The heuristics confirm a PDF JavaScript exploit cluster, suggesting the script is designed to download and execute a secondary payload. The presence of obfuscated JavaScript and exploit indicators points to a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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_obj0005_000.js` `fd5622158667d315e30e8ca3248f5044044c08ea08248a4208dfabadefaaef19`	pdf-javascript-stream	PDF /JS object 5 at offset 0x1DA	117767 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0005_001.js` `de515385c191d9544c1786968cad2741950877fe34396d2f780dfde02fcd942b`	pdf-javascript-stream	PDF /JS object 5 at offset 0x1FF	118013 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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