If the documents have fixed format like Structured or unstructured you can get the data by using Regex or String manipulation and also doc understanding processes.
If the Table always contains values and will not have any blank values, We could adopt the regex method of retreiving the records and adding the records to a Datatable, then write it to an Excel sheet.
Could you gives us a Confirmation whether the data will always be present for each column in the PDF table ? If you have the case of empty values, Could you provide that case data along with the case which has non-empty values in columns.
Providing samples of different scenarios would help us better analyse the problem and suggest the appropriate approach.
Could you check the workflow provided in the below post :
If the PDF has a Simpler table, this workflow should be able to extract and save it in Excel. This might not work for all types of PDF.
However, Do try this and let us know if you get any errors.
Also, for the regex method extraction, we would require a Sample PDF or the exracted text to check further the patterns, analyse and provide a better solution. You could also research on the regex part as there are many tutorials available in the Forum :