You can use the following steps to prevent PDF file from being corrupted... Click Add file button to add a file. Select PDF file from the dialog box In the Add file dialog box, click Advanced button. Set File Type to Binary in the combo box. Also if this guide can’t help you, look at next resources... http://www.filerepairforum.com/forum/adobe/adobe-aa/pdf/1614-how-fix-pdf - in case you can’t restore your .pdf file manually http://www.pdf.openfiletool.com/ PDF Open File Tool - alternative solution with free demo version https://forums.adobe.com/message/6978758 - where you see similar trouble and offers for struggling with it ... View more