PDF malware analysis — malicious · 055d412ced2c3222

MALICIOUS

PDF

108.4 KB Authoring application: PyPDF2

MD5: 9cf04d1112b07f2b594e81970d52bd5d SHA-1: c1b3a104d75604f58c1dd11de4e8fdae644c29e9 SHA-256: 055d412ced2c3222db8590dda95c07f9ef120df7c64d6a8f5f7487450419eb35

148 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file was flagged as malicious by an ML classifier and exhibits multiple JavaScript-related heuristics, including eval() calls and an exploit cluster. The embedded JavaScript streams are heavily obfuscated, but their presence and the nature of the heuristics suggest they are designed to exploit a vulnerability and execute further malicious code, likely a downloader. The file's origin as a PDF suggests it was likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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_obj0004_000.js` `e1b687dedf0516a79131c0dedee57ea94c472e066cb95681202855d0ce256e60`	pdf-javascript-stream	PDF /JS object 4 at offset 0x12E	99338 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0004_001.js` `e7d9e81740d446d703a04fa23c67c037e85813695a42778b8dbda97ee035cfe6`	pdf-javascript-stream	PDF /JS object 4 at offset 0x12E	97979 bytes

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