When I open an imported PDF document that contains maths symbols ,those symbols are read incorrectly

In particular, there are systematic errors so that ,for example,  equals signs in the orignal become minus signs in my opened version and minus signs appear as blanks..
Here is an error message that I receive
'cannot extract the embedded font EFNJGD+AdvP4C4E46 Some characters may not display or print properly'
I am using Adobe X reader with recent updates, Windows 7, A new PC with Word,
Other UK users don't have the same problem when I forward the guilty PDF files to them
Any help appreciated !

It could be the case that the particular font is not available on your system and is not embedded in the PDF either. Hence, some symbols specific to that font are not displayed in the PDF.
The font could be avilable on the other user's machine, which would be enabling them to see the PDF contents corectly.
Try and install the same font on your system and see if the problem is resolved.

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