Malformed Packet means that the software who read/interpret the data inside the packet does NOT understand it.
It could be :
- bug in the software
- not up-to-date software
- bad data in packet
Note that a message could be sent/received on many packets.
Then the software will NOT understand the message if :
- your capture does not contain all packets (especially the 1st ones)
- you have TCP cheksum problems (-> uncheck Edit / Preferences / Protocols / TCP / Validate checksum)
What does this mean?