Thank you for your PDF files and I can reproduce it on my machine.
Based on my research, the file corrupts because VSS treats it as a text
file. You can use the following steps to resolve it when adding PDF files.
1. Click Add file button to add a file.
2. Select PDF file from the dialog box
3. In the Add file dialog box, click Advanced button.
4. Set File Type to Binary in the combobox.
This will prevent the PDF file from being corrupted.
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