Is sending an object created via intent.getSerializableExtra to handler.postDelayed leading to Code Execution?

Is sending an object created via intent.getSerializableExtra to handler.postDelayed leading to Code Execution?

I'm new to android pentesting and I would like to know :

if sending an object created via the result of intent.getSerializableExtra("EXTRA_TEST");

to handler.postDelayed(TheObject,500) could lead to a vulnerability ?

like

d.a aObject = (d.a) intent.getSerializableExtra("EXTRA_BUY_TAB_START_POSITION_EXPLORE");
if (aVar2 != null) {
    this.handler.postDelayed(new e(aVar2), 500);
}

I imagine that if we send an intent with a serialized runnable the target application would execute the malicious code... Is it right ?

edit : "d" is : public final class d extends Fragment and d.a is

public static final class a {
        private a() {
        }

        public /* synthetic */ a(DefaultConstructorMarker defaultConstructorMarker) {
            this();
        }

        public final d a() {
            return new d();
        }
    }