A couple years ago my friend asked me to a look at an Excel ODS file he couldn't get to open. He said at the time it was the only file he couldn't open and I don't remember finding any malware on his computer (at the time). I tried a few of the file recovery sites at the time (back in 2014) and nothing ever worked. Since it was 1 file, he said don't worry about it.
Now today he calls me about another file which is a PDF. Turns out on 6/24/2014 there is about 15 files in his My Docs that all have the same date and time within 2 minutes with all the same problem. They range from JPG, PDFs, to ODS files. I tried several of the different decryption tools I could find and none of them detect the encryption. So I'm trying to figure out if they are encrypted or just corrupted and lost.
The id-ransomware could not determine anything and there are no readme or txt files from that timeframe on his computer.
If you open the file in notepad, they all start with the same "ôÓó ˜É—½ " code.