Recover Corrupt Files - Word, Excel, PDF

I'm trying to recover a folder with some critical data that was damaged or corrupted, likely by a virus. Its a 10GB folder that contains Word, Excel, and PDF documents. None will open, and each report that the format of the file is invalid and/or does not match the extension.

I tried free file repair tools online with no luck. I'm looking for the best tools or services, free or fee-based, that will give me the best chance of recovering at least some of this data.

Error messages for each file type are attached, though Excel docs just don't return anything.

Any suggestions would be greatly appreciated.
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byundtConnect With a Mentor Commented:
There are also a couple of ransomware viruses that affect Office files. I hope this isn't your problem, because the files are toast. You can remove the infection using the Microsoft Safety Scanner ( Although the issue applies to other file types as well, the issue is discussed in Updated 9/11 - "Excel cannot open the file [filename] because the file format or file extension is not valid." opening Office files
Manjunath SulladTechnical ConsultantCommented:

Please scan your entire hard disk with McAfee Total security (You will get free for 30days) and you can use this.

Here you have option to clean the infected files.

For more infomation related to adobe reader :
jsnrbyAuthor Commented:
I've scanned them multiple times but no viruses have been found. The files may have been corrupted another way. Are there other tools available to repair the corrupt files?
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Alan HardistyCo-OwnerCommented:
The virus that is doing the rounds at the moment encrypts the documents and unless you pay the $300 ransom, you won't get them unencrypted.

You need to restore the files from backup to be able to gain access to them again or if you don't have a backup, then hopefully you have a trace of the virus left so you can pay the $300 ransom to unencrypted the files.

Do you have them backed up?

The virus is usually sent via email and has an attachment which once opened, starts encrypting your files!!

The second link in my opening Comment included some extra characters. I have fixed it so it works.
jsnrbyAuthor Commented:
This was a shared folder on my corporate network. It seems like ransomware but no one reported the ransom popup, and the files don't appear infected when scanning, just unreadable. Should they appear infected or just damaged?
Alan HardistyCo-OwnerCommented:
The ransomware that is doing the rounds is Cryptolocker and this scans local and network files and will encrypt a variety of files that it is configured to find.

There is a good write-up about it here:

The problem user may have Googled it and managed to remove it without you knowing.

You may try some data recovery softawre tools to fix your corrupt PDF or Word documents, such as

DataNumen PDF Repair



DataNumen Word Repair

jsnrbyAuthor Commented:
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