APK
application/octet-stream
Magic Bytes
Offset: 0
50 4B 03 04 50 4B 05 06 50 4B 07 08
Android Package (APK) is the package file format developed by Google and the Open Handset Alliance for the distribution and installation of mobile applications on the Android operating system. It serves as a ZIP-based container for compiled code, resources, and manifest files necessary for software deployment on mobile devices. Although the format is standard for local installations, users should exercise caution as APKs can execute arbitrary code and may contain malware if obtained from unverified third-party sources.
Validation Code
How to validate .apk files in Python
Python
def is_apk(file_path: str) -> bool:
"""Check if file is a valid APK by magic bytes."""
signature = bytes([0x50, 0x4B, 0x03, 0x04, 0x50, 0x4B, 0x05, 0x06, 0x50, 0x4B, 0x07, 0x08])
with open(file_path, "rb") as f:
return f.read(12) == signatureHow to validate .apk files in Node.js
Node.js
function isAPK(buffer: Buffer): boolean {
const signature = Buffer.from([0x50, 0x4B, 0x03, 0x04, 0x50, 0x4B, 0x05, 0x06, 0x50, 0x4B, 0x07, 0x08]);
return buffer.subarray(0, 12).equals(signature);
}
Go
func IsAPK(data []byte) bool {
signature := []byte{0x50, 0x4B, 0x03, 0x04, 0x50, 0x4B, 0x05, 0x06, 0x50, 0x4B, 0x07, 0x08}
if len(data) < 12 {
return false
}
return bytes.Equal(data[:12], signature)
}API Endpoint
GET
/api/v1/apk
curl https://filesignature.org/api/v1/apk