If you are unable to edit PDF files on Acrobat Reader DC, this guide can help you view and edit PDFs without any issue using Acrobat DC.

See what you can do to fix the problem quickly. Adobe Acrobat Reader could not open PDF Earlier, Acrobat products performed no checks on the extraneous bytes present before the %PDF-header.

If you receive PDF files from your customers, you can configure Adobe Acrobat to prevent your employees from opening hyperlinks included in PDF documents.

Instead, you can use the free Acrobat Reader program to sign the PDF directly. In fact, Acrobat Reader gives you a few different ways to sign a PDF.