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To start extracting data from an Android device it has to be unlocked. If it's locked you can:
cat /proc/partitions(search the path to the flash memory, generally the first entry is mmcblk0 and corresponds to the whole flash memory).
df /data(Discover the block size of the system).
- dd if=/dev/block/mmcblk0 of=/sdcard/blk0.img bs=4096 (execute it with the information gathered from the block size).
Use Linux Memory Extractor (LiME) to extract the RAM information. It's a kernel extension that should be loaded via adb.