The npm package devplatform-react-query-s3-client version 35.8.7 contains malicious code that downloads and executes platform-specific binary payloads from obfuscated and suspicious Cloudflare Workers hosts and fallback domains. The payload is saved under deceptive filenames in temporary directories and executed detached from the main process. The package includes telemetry evasion techniques and disguises its network destinations to avoid detection. This malicious behavior is unrelated to any legitimate S3 or React Query SDK functionality.