Printable shellcode, composed entirely of printable characters, offers significant advantages over traditional shellcode by enhancing its resilience against filtering or modification. However, existing printable shellcode generation methods for the prevalent ARMv8 architecture produce excessively large shellcode, limiting their practicality in real-world exploitation scenarios. This paper addresses the limitation by proposing innovative framework for generating compact printable shellcode on ARMv8 architectures. And we implemented the prototype system, named Proteus. Proteus introduced two key techniques. The first technique involves an embedded instruction patcher that automatically generates the necessary backward jump instruction for the decoding loop during runtime, significantly minimizing the decoder’s static footprint. The second technique employs a compact encoding algorithm that transforms arbitrary three-byte sequences into four printable characters, thereby drastically reducing encoding overhead. Thus, Proteus has the capability to efficiently convert arbitrary ARMv8 shellcode into its printable equivalent. The comprehensive evaluation results demonstrate the feasibility and significant performance enhancements compared to the state-of-the-art work. The information redundancy of encoding algorithm is reduced from 1 down to 0.25, and the decoder length is dramatically shrunk from 4250 bytes to just 180 bytes.