PDF Corrupt file after being using in sql 2008

I have SQL 2008 database a database with PDFs stored on it. The app reads the PDF from the database and stores it on the machine as a temp file, then launches Acrobat Reader. At that point, I receive a message that the file format is invalid. I receive the same message when I have the app save the file as .pdf. I'm reading the PDF from the database using the Filestream object. Is there a way to prevent this?

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