Random maps inside the memory stick

So i wanted to update my firmware to 6.61 for my PSP 1004 and when i plugged it in my PC, i had some random maps, which are not the original maps. I plugged it in like 1-2 weeks before and there were the normal maps "ISO, etc." but now there are random maps "data, dic, font, kd (and more)" Can someone help me, because i don't know what to do now. And there appears to be a file named " i left this for you.pdf" (executable jar file) i dont want to open it because i know this isnt something good. Please help.