I have some pdf files of large size (several hundreds to thousand pages). I need to search for the contents.
Because the files were generated using user-defined fonts, the search cannot find anything that I need. But I can see there are contents with the words I searched.
May anyone suggest me what I can do please?
Maybe the PDF page content is an image of the source text?
If so, try OCR to provide content.
Or, if all is renderable text, play with the TouchUp Text tool (Acrobat Pro).
Select some text, right click to open the context menu, select Properties.
In the Text tab, change to a font that is available on the local machine.
Other than having the source content changed so that standard fonts are used and then making a new output PDF there may not be much else possible.