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How can I manage and repair a corrupted PDF file?

HP Recommended
HP 15-bw625ur
Microsoft Windows 10 (32-bit)

For a long time I was engaged in preparing the project's graphic data for the community in a pdf-file. But after an unexpected system failure, this file does not open in Adobe Acrobat X. An error has occurred on the screen: Unknown file type. Attempt to reinstall the program and restart the file did not give positive results. What else can I try in this case? The finished project will have to be redone from almost the initial stages. . .

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Evening & let's review some background before progressing with your question


1993 the first official PDF file was introduced by Adobe. Thus if one has an issue with thier PDF file, then one should create an account with Adobe and submit thier question within thier system or forum.


Next if Adobe is unable to support your issue, sites like can attempt to recover all or what was left of your PDF.  Something else to consider, is how or where was the PDF saved. For instance if the PDF was saved to an SD card, then the lads on the card could be dmged or oxidized. Cleaning the leads before mounting the SD card into a crd reader would benefit accessing the data with out issues. But s we all know, the simplest things can and will occur thus a file or folder corruption would insure.


As with this command,


chkdsk E:/ etc

 Could be useful in so e cases if the PDF was saved on flash drive or an SD card. Otherwise waiting here could prove beniful or fruitless based on the knowldge of those who may hve encountered the same issue. Contacting Adobe would be a better alternitive.

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Adobe PDF repair tool



  1. Open the secured PDF file.You can use Adobe Acrobat to do this. You must be the creator of the document, or have the password for this method to work.


  1. Click the Secure button.This button is located in the Tasks toolbar. It is easily identified by the padlock icon.
    • Choose the Remove Security option if you want to completely unsecure the PDF file. If you previously assigned a Permissions Password to the secure PDF file, you will have to enter it at this time to complete the process.
  1. Change encryption settings.If you would rather adjust the encryption settings as opposed to unsecuring the PDF file, Click on the "Permission detail" link under the Secure button.
  • Click "Change settings" in Document properties under Security tab after selecting "Certificate security" in drop-down list. You may also click and select "No Security" from drop down list to fully unsecure document.
  • Select your encryption level and click next.
  • You will need Digital ID to encrypt document. You may use any existing ID or create a new one for you.
  • Check a recipient’s trusted identity, change a recipient’s permissions or remove recipients if you want to alter these items, then click Next.

Click Finish and OK to save your changes and close the document properties window. Save the PDF file to implement the changes you have made.

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