# 获得pe文件类型 dll/exe/sys等
def get_file_type(binary) :
    file_type = -1
    if binary.header.has_characteristic(lief.PE.HEADER_CHARACTERISTICS.DLL) == True:
        # dll
        print("dll")
    else:
        # sys
        if binary.get_import("ntoskrnl.exe") \
          and binary.optional_header.subsystem == lief.PE.SUBSYSTEM.NATIVE:
            print("sys") 
        # exe
        else: 
            print("exe")