You can convert the PDF into Word document using AnyBizSoft PDF to Word Converter, then change the font color, then you can read the hidden text.
It can preserve the original text content, images, layouts after conversion, so you won’t lose the formatting.
Follow these simple steps
Click here to download AnyBizSoft PDF to Word the converter. Install it. Open it and Import the pdf files where text are hidden. Click convert and you are done.
You can see the tutorial below:
It will convert the pdf file to .docx file and there you can see all the hidden files. If you want you can again save that .docx file as pdf file and the hidden text also be shown .