Actually, the problem with the files you provided is that they do not end with %%EOF marker. This marker is required for RadPdfViewer to work correctly. If you open your files with any text editor (Notepad for example), you will find that your document ends with a lot of null bytes. RadPdfViewer is designed to search for %%EOF marker in the last 1024 bytes. If it does not find one, the document will not be displayed at all. You will need to trim those null bytes in order to open the documents in RadPdfViewer.
More information about this can be found in this help article
Let us know if you have further questions.
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