Overview:
Fonts are not embedded in the Draft version of source PDF files prior to loading into Vault. The first page in the new Draft version of a PDF source file displays similar content to the previous version.
Root Cause:
Some of the fonts are not embedded in the new Draft version of the source PDF file before it is uploaded into Vault.
Solution:
If this behavior is seen on a document, please embed all fonts in the PDF source file using Adobe Acrobat Pro.
Once this is done, the PDF source file successfully loads into Vault.
Related Documentation:
PDF Fonts: Font Embedding and Substitution
Thank you