VM
text/plain
Magic Bytes
Offset: 0
54 68 69 73 20 69 73 20 54 65 58 2C
The VM format is a Virtual Memory file generated by the TeX typesetting system, originally developed by Donald Knuth at Stanford University. It serves as a pre-compiled memory dump used to accelerate the loading of macros and fonts during document processing routines. As a legacy format primarily associated with older Unix-based TeX implementations, it carries minimal security risk because it consists of static binary data strictly interpreted by the host typesetting engine.
Validation Code
How to validate .vm files in Python
Python
def is_vm(file_path: str) -> bool:
"""Check if file is a valid VM by magic bytes."""
signature = bytes([0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x54, 0x65, 0x58, 0x2C])
with open(file_path, "rb") as f:
return f.read(12) == signatureHow to validate .vm files in Node.js
Node.js
function isVM(buffer: Buffer): boolean {
const signature = Buffer.from([0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x54, 0x65, 0x58, 0x2C]);
return buffer.subarray(0, 12).equals(signature);
}
Go
func IsVM(data []byte) bool {
signature := []byte{0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x54, 0x65, 0x58, 0x2C}
if len(data) < 12 {
return false
}
return bytes.Equal(data[:12], signature)
}API Endpoint
GET
/api/v1/vm
curl https://filesignature.org/api/v1/vm