It looks like there is no tax treaty between Malaysia and the US.
If the treaty does not cover a particular kind of income, or if there is no treaty between your country and the United States, you must pay tax on the income in the same way and at the same rates shown in the instructions for the applicable U.S. tax return.
Trying hard to answer the question, as per 'Bacon's comment. It looks like the income is not taxable if all of the following are true:
You perform personal services as an employee of or under a contract with a nonresident alien individual, foreign partnership, or foreign corporation, not engaged in a trade or business in the United States; or you work for an office or place of business maintained in a foreign country or possession of the United States by a U.S. corporation, a U.S. partnership, or a U.S. citizen or resident.
You perform these services while you are a nonresident alien temporarily present in the United States for a period or periods of not more than a total of 90 days during the tax year.
Your pay for these services is not more than $3,000.
But I can't find a specific reference anywhere to the case in point; I am not a tax lawyer or CPA, objects in the mirror are bigger than they appear, YMMV, etc.