How exactly are you creating the PDF file? What version of Acrobat do you have? What Office version? What OS?
A lot of information is missing to be able to help you...
Sorry for the lack of details:
Select it as a "printer" within excel.
Windows 10 pro
Microsoft office 365 pro plus
Adobe acrobat distiller XI
Lenovo P70 2.8 Ghz - 64 GB of ram
Excel file size 1000 KB
Try using the PDFMaker plugin (the Acrobat tab in the ribbon), instead.
I couldn't select the "selection" option to create a pdf of the graph. I selected the cells around the graph then I was allowed to click on "selection" to create pdf. After a few minutes Excel crashed and a message came up saying something to the extent that excel was having problems with pdf add-in asking if I wanted to disable it.