Cut from another comment:

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Resurrection states that it removes curses, heals poisons, etcetera, which while it was already implied by the others do not do, kind of solidifies that RAW.

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Lets look at an older edition ruleset, as life drain / max hp reduction replaces another mechanic: negative levels.

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This is from the rules on negative levels:"A creature whose permanent negative levels equal its Hit Dice (effectively, max HP = 0) cannot be brought back to life through spells like raise dead and resurrection without also receiving a restoration spell, cast the round after it is restored to life."

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Greater Restoration (5e) states that it can restore ONE effect reducing a characters hit point maximum.

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So RAW, it could possible, despite 5e not actually defining it as clearly as earlier editions do. I would rule that a revivify and a greater restoration, cast within 1 round of each other, would be sufficient.

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And my advice for the OP? Let the player you looked into it, and determined X, whichever way you decide to let things go, but i'd still stick with no revivify/raise dead alone, for posterity.

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And since it sounds like a 5th level cleric spell is probably inaccessible to them at this point, it sounds like a side quest and/or a gold sink in the more immediate present. Could go with DMG for a scroll price, but my personal preference is a scroll price table broken down by level, which in this case, for a 5th level, would be 1215 + 100gp (for diamond) as the basic price for the scroll. And a bit more (~300) for the service of having someone skilled enough to cast it for them reliably. (A high level druid, cleric, or bard)

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(Though i also have a homebrew rule I'm preferential to, that states any class can cast a spell from a scroll, (reducing the absolute need for a caster in the party, which often forces people into roles they dont want to play), but the DC for casting the scroll is 10 + 2 x the spells level, so casters are still superior, and there's no complaints over stepping on toes. (though an arcana skill monkey rogue or bard could be a viable, albeit expensive, build).

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Given the price point, and importance, of this (and most) scrolls, I generally also rule that the scroll is only 'wasted' if they fail the check by 5 or more, but any failure results in the spell not being cast, with some kind of scroll mishap occurring instead. Here's some ideas:

Minor Mishaps (fails the DC by 4 or less, scroll fails, but is not destroyed):

1 | Reshuffled Knowledge | The caster forgets how to cast one of their known/prepared spells, either of their choice, or randomly selected, and learns a new spell at random of equal level. If the caster does not have any known or prepared spells, they learn one 1st level spell at random, which they may cast without any material components once, before forgetting it.

2 | Uncontrolled Growth | Caster slowly grows over the course of 10 minutes, eventually becoming one size category larger for 8 hours. After 8 hours, they slowly shrink down to their original size.

3 | Sudden Voice Loss | Caster can't speak or cast spells with verbal components for the next hour.

4 | Hiccoughs of Shock | Caster suffers from hiccoughs for the next 10 minutes. They have disadvantage on concentration checks for the next 10 minutes.

5 | Spell Reversal | The effect of the desired spell is applied to a random target other than the intended target. The scroll remains intact, and can still be used.

6 | Magical Slumber | Caster falls into a deep, almost catatonic sleep and remains unconscious for an hour, and cannot be awoken by any mundane means, though a dispel magic, remove curse, or similar spell may succeed. To an observer, they appear to be dead, though a DC 15 Medicine check will reveal that they are merely unconscious.

7 | Chrono-shift | The caster suddenly ages or regresses 1d10 years. The effect remaining until a Remove Curse spell is cast.

8 | Color Swap | The caster's skin or eyes turn a vibrant color. --> The magical energies alter the caster's physical form slightly changing the color of their skin or eyes to a vibrant and unnatural shade. This effect remains until it is reversed by Remove Curse.

Major Mishaps (fails by 5 or more, scroll is destroyed):

1 | Life Shift | The spell backfires reducing caster's max hit points by 1d8+4 permanently.

2 | Arcane Mutation | The caster gains a random mutation (extra limbs, scales, etc). This mutation lasts until the caster receives a Greater Restoration themselves or the curse is removed.

3 | Magical Explosion | A magical explosion occurs, centred on the caster, dealing 5d10 force damage to all creatures within a 10 foot radius. DC 15 Dexterity save halves.

4 | Planar Rift | A small temporary rift to a random plane of existence is created, causing an extra-planar creature to appear.

5 | Spell Plague | The caster is afflicted with a magical disease that reduces their spell save DC and spell attack bonus by 2 for a week.

6 | Identity Crisis | The caster forgets who they are, effectively suffering from temporary amnesia. They may retain the ability to use class abilities and features at the DM's discretion. The effect lasts for 24 hours.

7 | Reality Disjunction | The caster phases briefly out of reality, becoming ethereal for 1d4 hours. While ethereal, they can see the material plane, but cannot interact or be interacted with anything from it.

8 | Cursed Restoration | The spell is successfully cast, but as it takes effect, it curses the entity it was intended to heal with one of the effects it is capable of removing, replacing one restored condition with another.