Embedded files store other documents (like spreadsheets, images, or presentations) directly within a PDF. They function differently from hyperlinks pointing to external files. You can typically access them using PDF reader software like Adobe Acrobat (or Acrobat Reader) or Preview. Instead of clicking an external link, you interact directly with the embedded object inside the PDF document itself to open the included file.

This feature is valuable for combining supporting documentation into a single, portable PDF package. For instance, a financial consultant might embed an Excel budget spreadsheet within their PDF report for clients to examine the data. An architect might embed detailed CAD drawings within the PDF project proposal submitted to a contractor, ensuring all relevant files are contained together.

Accessing embedded files requires compatible viewer software permissions. Crucially, users must trust the source, as embedded files can contain malware. Developers must intentionally enable embedding; not all PDF readers support viewing every embedded file type, potentially requiring specific applications. This functionality demands responsible use to prevent unintended sharing or potential security risks.