The file is damaged and could not be repaired opening pdf file

Does it still work if you turn off the STREAM profile? Let's try some additional logging:

when HTTP_REQUEST { 
    set LogString_L1 "Client [IP::client_addr]:[TCP::client_port] URL: [HTTP::host][HTTP::uri]" 
    STREAM::disable 
} 
when HTTP_RESPONSE {
    log -noname 192.168.222.63 local7.debug "Content-Type = [HTTP::header Content-Type]"
    if { [HTTP::header Content-Type] contains "text" } {
        set LogString_L2 "$LogString_L1 - status: [HTTP::status]" 
        STREAM::enable
    }
} 
when STREAM_MATCHED { 
    log -noname 192.168.222.63 local7.debug "INTERNAL FOUND STREAM MATCH '[STREAM::match]' originating from $LogString_L2" 
}