Files can get corrupted easily when transmitted online. PDF is among the most popular file formats. So has a lot of redundancy to enable restoring and extracting of data in worst case scenarios’
If you still cannot read the PDF then there are free online services like PDFaid which can help recover your PDF.
Another option is to use a PDF to Word converter to extract what you can out the file in another format.
It’s only after trying these solutions that you need to consider specialist help.
Do you use free tools, or prefer to go down the paid route straight away?