1. Open your Web browser and go to PDF Tools (see Resources). Press "Enter" and wait for the website to load.
2. Click the "Choose File" button. Select the corrupted PDF file in the prompt that appears, then click "Open." Click the button that says "Load PDF."
3. Select the check box that says "Recover pages" in the next section. Click the button that says "Execute."
4. Read the text that appears in the next section to make sure all of the data was recovered, then click the "Save as" button to save the pages as a new PDF file
5. In case the method can't assist you, then use more powerful way
https://www.openfiletool.com/pdfopen.html PDF Open File Tool