Viewing the Embedded PDF
MISMO XML files contain a PDF of the entire original report in addition to a subset of the report data in its "raw" XML form. The PDF has been encoded using a process called "base-64" which simply means that the data is represented as characters within the XML file. Normally, this would appear as inscrutible gibberish, but UAD Reader can decode the data and display the PDF for you to review.
By default, UAD Reader displays the PDF within the XML file when it opens, but that's a preference that can be changed in settings.
If you're currently viewing the XML or the UARR Results, click the View PDF tab at the top of the window to see the PDF that's embedded in your XML file.