5 consecutive bad sectors. Lets hope that this is all there is. Remember that data for one of the blocks (2 sectors) at least is present in the ext4 filesystem journal. Once the SD card data is copied to a working media, mounting the filesystem will hopefully recover that block from the journal replay.
Most of your data ought to be intact (2.5kB out of 4GB is next to nothing, but of course not every block is as important as the other one).--
Got some spare cpu cycles ? Join Team Helix or Team Starfire!