Polyglot detection

A polyglot file is a single file that is validly interpreted as two or more different formats, for example an image that is also a Java archive, or a PDF carrying a complete ZIP after its logical end. Each face is standards-compliant on its own, so scanners that assign a file exactly one type analyze only that face and the other format rides through untouched.

When polyglot is among the selected object types, each face is also carved out as its own file — polyglot_part_1.pdf, polyglot_part_2.zip, … — and handed back to the workflow for full processing as what it really is. A hidden DOCX inside a PDF polyglot is not merely reported; it gets analyzed and sanitized like any other file.